Shigella species are identified through a series of biochemical tests. Gram staining shows gram-negative bacilli that are non-motile. Catalase and oxidase tests are positive and negative respectively, indicating it is a member of the Enterobacteriaceae family. On MacConkey agar, it forms non-lactose fermenting colonies. Mannitol fermentation and ONPG tests help differentiate the four Shigella species. Identification of pathogenic bacteria is important for appropriate treatment of infections.
The document discusses identification of pathogenic bacteria in a clinical microbiology laboratory. It provides guidance on identifying common gram positive and gram negative bacteria through microscopic morphology, biochemical tests, and growth characteristics. Key tests discussed include gram stain, catalase, coagulase, optochin sensitivity, bile solubility, and indole for differentiating between staphylococci, streptococci, pneumococci, enterococci, and neisseria.
This document provides guidance on identifying pathogenic bacteria in a clinical microbiology laboratory through a series of tests. It discusses identifying Gram positive cocci like Staphylococcus, Streptococcus, and Pneumococcus using tests such as catalase, coagulase, and optochin sensitivity. It also covers identifying Gram negative cocci such as Neisseria and differentiating pathogenic from non-pathogenic species. Further, it outlines approaches to identifying Gram positive bacilli including Bacillus and Corynebacterium, and Gram negative bacilli within the Enterobacteriaceae family including E. coli, Klebsiella, Citrobacter, and Enterobacter through biochemical tests.
This document provides information on the laboratory diagnosis of various bacteria, including their gram stain characteristics, shape, arrangement, species, special characteristics, transmission, and diagnostic tests. It discusses cocci such as Staphylococcus, Streptococcus, and Neisseria. It also discusses rods including Bacillus, Corynebacterium, Clostridium, Klebsiella, Shigella, Salmonella, Proteus, Treponema, Haemophilus, Vibrio, Campylobacter, Helicobacter, Pseudomonas, and Bordetella. Identification is based on gram stain, growth characteristics like hemolytic patterns and catalase production, and sensitivity to specific antibiotics.
This document provides information on the laboratory diagnosis of various bacteria, including their gram stain characteristics, shape, arrangement, species, special characteristics, transmission, and diagnostic tests. It discusses cocci such as Staphylococcus, Streptococcus, and Neisseria. It also discusses rods including Bacillus, Corynebacterium, Clostridium, Klebsiella, Shigella, Salmonella, Proteus, Treponema, Haemophilus, Vibrio, Campylobacter, Helicobacter, Pseudomonas, and Bordetella. Identification is based on gram stain, growth characteristics like hemolytic patterns and catalase production, and sensitivity to specific antibiotics.
Staphylococci can cause many forms of infection. (1) S aureus causes superficial skin lesions (boils, styes) and localized abscesses in other sites. (2) S aureus causes deep-seated infections, such as osteomyelitis and endocarditis and more serious skin infections (furunculosis). (3) S aureus is a major cause of hospital acquired (nosocomial) infection of surgical wounds and, with S epidermidis, causes infections associated with indwelling medical devices. (4) S aureus causes food poisoning by releasing enterotoxins into food. (5) S aureus causes toxic shock syndrome by release of superantigens into the blood stream. (6) S saprophiticus causes urinary tract infections, especially in girls. (7) Other species of staphylococci (S lugdunensis, S haemolyticus, S warneri, S schleiferi, S intermedius) are infrequent pathogens
This document discusses Staphylococcus aureus and methods for its laboratory diagnosis. It notes that S. aureus is commonly found in the nose and can cause infections, while S. epidermidis lives on the skin and S. saprophyticus in the vagina. Diagnosis involves collecting samples from infections and using gram staining, culturing, and biochemical tests like catalase, coagulase and novobiocin to identify the species. Rapid PCR tests are also now used to diagnose S. aureus.
Streptococci are Gram-positive cocci that occur in pairs or chains and are classified based on hemolysis, Lancefield grouping, and antigenic differences. Key pathogenic species include:
S. pyogenes (Group A), which causes pharyngitis, scarlet fever, impetigo and other skin infections, necrotizing fasciitis, and post-streptococcal sequelae.
S. agalactiae (Group B) colonizes the genital tract and can cause neonatal sepsis and meningitis.
S. pneumoniae is a common colonizer that causes pneumonia, meningitis, sinusitis and otitis media.
Vir
The document discusses laboratory diagnosis of Staphylococcus and Streptococcus bacteria. Key tests include gram stain, catalase test, coagulase test, mannitol salt agar, and novobiocin disc test to differentiate medically important staphylococcal species. For streptococci, hemolytic patterns on blood agar, optochin and bacitracin disc tests are used. Common pathogens include S. aureus, S. epidermidis, S. saprophyticus, S. pyogenes, S. agalactiae. Diseases range from skin infections to bacteremia, with S. aureus a major cause of infections like osteomyelitis, pneumonia and infect
The document discusses identification of pathogenic bacteria in a clinical microbiology laboratory. It provides guidance on identifying common gram positive and gram negative bacteria through microscopic morphology, biochemical tests, and growth characteristics. Key tests discussed include gram stain, catalase, coagulase, optochin sensitivity, bile solubility, and indole for differentiating between staphylococci, streptococci, pneumococci, enterococci, and neisseria.
This document provides guidance on identifying pathogenic bacteria in a clinical microbiology laboratory through a series of tests. It discusses identifying Gram positive cocci like Staphylococcus, Streptococcus, and Pneumococcus using tests such as catalase, coagulase, and optochin sensitivity. It also covers identifying Gram negative cocci such as Neisseria and differentiating pathogenic from non-pathogenic species. Further, it outlines approaches to identifying Gram positive bacilli including Bacillus and Corynebacterium, and Gram negative bacilli within the Enterobacteriaceae family including E. coli, Klebsiella, Citrobacter, and Enterobacter through biochemical tests.
This document provides information on the laboratory diagnosis of various bacteria, including their gram stain characteristics, shape, arrangement, species, special characteristics, transmission, and diagnostic tests. It discusses cocci such as Staphylococcus, Streptococcus, and Neisseria. It also discusses rods including Bacillus, Corynebacterium, Clostridium, Klebsiella, Shigella, Salmonella, Proteus, Treponema, Haemophilus, Vibrio, Campylobacter, Helicobacter, Pseudomonas, and Bordetella. Identification is based on gram stain, growth characteristics like hemolytic patterns and catalase production, and sensitivity to specific antibiotics.
This document provides information on the laboratory diagnosis of various bacteria, including their gram stain characteristics, shape, arrangement, species, special characteristics, transmission, and diagnostic tests. It discusses cocci such as Staphylococcus, Streptococcus, and Neisseria. It also discusses rods including Bacillus, Corynebacterium, Clostridium, Klebsiella, Shigella, Salmonella, Proteus, Treponema, Haemophilus, Vibrio, Campylobacter, Helicobacter, Pseudomonas, and Bordetella. Identification is based on gram stain, growth characteristics like hemolytic patterns and catalase production, and sensitivity to specific antibiotics.
Staphylococci can cause many forms of infection. (1) S aureus causes superficial skin lesions (boils, styes) and localized abscesses in other sites. (2) S aureus causes deep-seated infections, such as osteomyelitis and endocarditis and more serious skin infections (furunculosis). (3) S aureus is a major cause of hospital acquired (nosocomial) infection of surgical wounds and, with S epidermidis, causes infections associated with indwelling medical devices. (4) S aureus causes food poisoning by releasing enterotoxins into food. (5) S aureus causes toxic shock syndrome by release of superantigens into the blood stream. (6) S saprophiticus causes urinary tract infections, especially in girls. (7) Other species of staphylococci (S lugdunensis, S haemolyticus, S warneri, S schleiferi, S intermedius) are infrequent pathogens
This document discusses Staphylococcus aureus and methods for its laboratory diagnosis. It notes that S. aureus is commonly found in the nose and can cause infections, while S. epidermidis lives on the skin and S. saprophyticus in the vagina. Diagnosis involves collecting samples from infections and using gram staining, culturing, and biochemical tests like catalase, coagulase and novobiocin to identify the species. Rapid PCR tests are also now used to diagnose S. aureus.
Streptococci are Gram-positive cocci that occur in pairs or chains and are classified based on hemolysis, Lancefield grouping, and antigenic differences. Key pathogenic species include:
S. pyogenes (Group A), which causes pharyngitis, scarlet fever, impetigo and other skin infections, necrotizing fasciitis, and post-streptococcal sequelae.
S. agalactiae (Group B) colonizes the genital tract and can cause neonatal sepsis and meningitis.
S. pneumoniae is a common colonizer that causes pneumonia, meningitis, sinusitis and otitis media.
Vir
The document discusses laboratory diagnosis of Staphylococcus and Streptococcus bacteria. Key tests include gram stain, catalase test, coagulase test, mannitol salt agar, and novobiocin disc test to differentiate medically important staphylococcal species. For streptococci, hemolytic patterns on blood agar, optochin and bacitracin disc tests are used. Common pathogens include S. aureus, S. epidermidis, S. saprophyticus, S. pyogenes, S. agalactiae. Diseases range from skin infections to bacteremia, with S. aureus a major cause of infections like osteomyelitis, pneumonia and infect
This document discusses Gram-negative rods of the family Enterobacteriaceae. It provides characteristics of the family including being facultative anaerobes that are Gram-negative rods and test positive for catalase and nitrate reduction. It also describes identification methods for Enterobacteriaceae including growth on selective media like MacConkey agar and biochemical tests. Key members are discussed and divided into lactose fermenters versus non-fermenters.
Staphylococci are spherical bacteria that occur in grape-like clusters. Staphylococcus aureus is an important human pathogen that can cause a variety of infections, from minor skin infections to life-threatening conditions like toxic shock syndrome and endocarditis. S. aureus produces several virulence factors like toxins and enzymes that damage tissues and evade the immune system. Laboratory diagnosis involves culture, microscopy, and tests like coagulase to identify S. aureus. Antibiotics are used to treat infections, and prevention focuses on hygiene and safe food handling. Methicillin-resistant S. aureus is an antibiotic resistant form that is more difficult to treat.
This document discusses the family Enterobacteriaceae and methods for identifying its members. Enterobacteriaceae are Gram-negative rods that ferment glucose with acid production and reduce nitrates. They can be divided into lactose fermenters and non-fermenters based on reactions on MacConkey agar and triple sugar iron agar. Identification involves Gram staining and biochemical tests like oxidase, indole, oxidative/fermentation, and nitrate reduction. Growth on selective media like MacConkey's, eosin methylene blue, and Salmonella-Shigella agars also aids identification.
teaching support for 2nd year medical school students: steps of the laboratory diagnosis of infections caused by bacteria of the genera Staphylococcus and Streptococcus
The document discusses the Enterobacteriaceae family of gram-negative bacteria. It notes that they are a diverse group that includes many pathogenic genera like Escherichia, Shigella, Salmonella, and Klebsiella. The document covers their characteristics, morphology, identification, growth patterns, antigenic structures, and taxonomy. It provides details on rapid identification of common genera and describes biochemical tests used to differentiate between members of the family.
This document contains slides and information about microbiological testing and identification of various bacteria and fungi. It includes schemes for staining bacteria with and without background staining. It also includes images of various microbes growing on different media like blood agar, chocolate agar and Loffler's serum. Various tests are described like coagulase testing of Staphylococcus, antibiotic sensitivity testing, phage typing and serological testing like Elek's test and tube agglutination testing.
This document provides an overview of Streptococcus bacteria, including characteristics, diseases caused, taxonomy, and methods for identification. Key points include:
- Streptococcus is a genus of spherical, Gram-positive bacteria that grow in chains. It includes over 50 species that are part of normal oral flora but can also cause diseases.
- Major diseases caused by different Streptococcus species include pharyngitis, pneumonia, toxic shock syndrome, and neonatal infections.
- Identification involves examining colony morphology on blood agar plates, microscopic appearance, and biochemical tests like catalase, optochin, and bile esculin tests.
- Classification is based on carbohydrate antigens identified through Lancefield grouping
Staphylococcus is a genus of bacteria that can cause a variety of infections in humans. The most common pathogenic species is Staphylococcus aureus, which was first identified in the late 19th century. S. aureus produces toxins and enzymes that allow it to infect skin, blood, lungs, and other tissues. It commonly causes skin infections like boils and abscesses but can also lead to serious diseases like pneumonia, meningitis, or toxic shock syndrome. Methicillin-resistant S. aureus (MRSA) infections are difficult to treat with many antibiotics. Laboratory tests are used to identify S. aureus from patient samples and test for antibiotic resistance.
Staphylococcus are spherical bacteria that grow in grape-like clusters. S. aureus is an important human pathogen capable of causing a wide range of illnesses from minor skin infections to life-threatening conditions like toxic shock syndrome. It produces many virulence factors like toxins and enzymes. Common infections include impetigo, boils, cellulitis, abscesses, osteomyelitis, pneumonia, and sepsis. Diagnosis involves culture and tests for coagulase and antibiotic resistance. Treatment requires drainage of infections and antibiotic therapy. Prevention focuses on hygiene, safe food handling, and complete treatment of infections.
E. coli is a gram-negative, facultative anaerobic rod that is commonly found in the gut of humans and animals. It has various virulence factors like somatic (O), flagellar (H), capsular (K) antigens and fimbriae that aid in colonization and pathogenesis. Major diseases caused are urinary tract infections, diarrhea, and other infections. Diarrheagenic E. coli are classified into six types based on virulence mechanisms - EPEC, ETEC, EIEC, EHEC/VTEC, EAEC, DAEC. EHEC secretes Shiga toxin/verocytotoxin which can cause hemorrhagic colitis and HUS. U
Stapplococus Bacteria in Medical Microbiologysararazi1508
Staphylococci are a genus of bacteria that can cause a variety of infections in humans. Staphylococcus aureus is one of the most common causes of staph infections. It is a gram-positive coccus that grows in clusters resembling grape clusters. S. aureus produces toxins and enzymes that allow it to infect the skin and deeper tissues. Common infections include impetigo, boils, cellulitis, abscesses, pneumonia, and toxic shock syndrome. Laboratory diagnosis involves culturing samples and identifying colonies based on their morphology, biochemical tests like coagulase production, and antibiotic sensitivity testing. Treatment involves antibiotics, but some strains like MRSA are resistant to many antibiotics.
This document provides information on Corynebacterium and diphtheria. It describes the general characteristics of Corynebacterium bacteria and discusses the species that are pathogenic, like Corynebacterium diphtheriae which causes diphtheria. The pathogenesis of diphtheria is explained, noting how the toxin spreads and affects different body systems. Methods for laboratory diagnosis, treatment with antibiotics and antitoxin, and vaccination against diphtheria are also summarized.
prof . dr. ihsan edan alsaimary
department of microbiology - college of medicine - university of basrah - basrah -IRAQ
ihsanalsaimary@gmail.com
00964 7801410838
This document discusses different types of staphylococci and streptococci bacteria. It provides background on staphylococci, including its classification based on pigment production and pathogenicity. It describes Staphylococcus aureus in more detail, covering its habitat, morphology, factors influencing pigment production, and pathogenicity, causing infections like boils and abscesses. The document also discusses streptococci classification based on oxygen requirement, hemolytic properties on blood agar, and Lancefield grouping. It provides more information on Streptococcus pyogenes and Streptococcus pneumoniae, including characteristics, transmission, pathogenesis, and laboratory diagnosis.
Salmonella is a gram-negative rod-shaped bacteria from the Enterobacteriaceae family. It is classified into two species, Salmonella enterica and Salmonella bongori, with over 2,500 serotypes identified. Salmonella can cause enteric (typhoid) fever through fecal-oral transmission, or gastroenteritis through contaminated food or water. Clinical manifestations depend on the infecting serotype and host factors. Laboratory diagnosis involves culture of blood, bone marrow, or stool to isolate the bacteria. Treatment focuses on hydration and antibiotics such as fluoroquinolones.
Salmonella is a genus of bacteria that can cause illnesses like typhoid fever, paratyphoid fever, and gastroenteritis. There are over 2,400 serotypes of Salmonella. Typhoidal Salmonella like S. typhi and S. paratyphi A cause enteric fever while non-typhoidal Salmonella usually cause food poisoning. Laboratory diagnosis of enteric fever involves culturing the bacteria from blood, feces, or other specimens. Serological tests like the Widal test detect antibodies against Salmonella. Isolates can be identified biochemically and through antigen testing. Vaccines are available to help prevent typhoid fever.
This document summarizes key information about Staphylococcus bacteria. It describes the history of Staphylococcus discovery and classification. It outlines the typical characteristics of Staphylococcus including being gram positive cocci that form clusters and produce catalase. The three main pathogenic species - S. aureus, S. epidermidis, and S. saprophyticus - are identified along with their roles in infection. Methods for laboratory diagnosis including culture-based identification and biochemical tests are also summarized.
The document discusses the classification, identification, and clinical significance of streptococci and enterococci bacteria. It describes how they are classified based on their hemolysis, Lancefield grouping, and other biochemical tests. Key genera include Streptococcus, Enterococcus, and Streptococcus milleri group. Identification involves cultural characteristics, catalase testing, and antibiotic sensitivity patterns. Clinically important species are S. pyogenes (GAS) which can cause strep throat, scarlet fever, and rheumatic fever.
This document provides information on the bacteria Proteus, including its characteristics, virulence factors, infections it causes, identification and treatment. It notes that Proteus is a gram-negative, motile bacillus that is commonly found in the intestines and can cause urinary tract and nosocomial infections. Its main virulence factors include urease production, which allows it to colonize the urinary tract, and fimbriae, which aid in attachment and colonization. Identification involves culturing on media like blood agar where it displays swarming motility and testing for properties such as being urease positive and oxidase negative. Treatment involves antibiotics like beta-lactams, aminoglycosides
1. Staphylococcus are Gram-positive cocci that occur in clusters and can cause a variety of infections through toxins or direct invasion. Common species include S. aureus, S. epidermidis, S. saprophyticus.
2. S. aureus is an important human pathogen capable of causing skin infections, pneumonia, sepsis and toxic shock syndrome. Virulence factors include coagulase, hemolysins and enterotoxins.
3. Laboratory diagnosis involves culturing specimens on selective media, testing for catalase and coagulase production, and antibiotic susceptibility testing. MRSA strains are resistant to multiple
This document discusses Gram-negative rods of the family Enterobacteriaceae. It provides characteristics of the family including being facultative anaerobes that are Gram-negative rods and test positive for catalase and nitrate reduction. It also describes identification methods for Enterobacteriaceae including growth on selective media like MacConkey agar and biochemical tests. Key members are discussed and divided into lactose fermenters versus non-fermenters.
Staphylococci are spherical bacteria that occur in grape-like clusters. Staphylococcus aureus is an important human pathogen that can cause a variety of infections, from minor skin infections to life-threatening conditions like toxic shock syndrome and endocarditis. S. aureus produces several virulence factors like toxins and enzymes that damage tissues and evade the immune system. Laboratory diagnosis involves culture, microscopy, and tests like coagulase to identify S. aureus. Antibiotics are used to treat infections, and prevention focuses on hygiene and safe food handling. Methicillin-resistant S. aureus is an antibiotic resistant form that is more difficult to treat.
This document discusses the family Enterobacteriaceae and methods for identifying its members. Enterobacteriaceae are Gram-negative rods that ferment glucose with acid production and reduce nitrates. They can be divided into lactose fermenters and non-fermenters based on reactions on MacConkey agar and triple sugar iron agar. Identification involves Gram staining and biochemical tests like oxidase, indole, oxidative/fermentation, and nitrate reduction. Growth on selective media like MacConkey's, eosin methylene blue, and Salmonella-Shigella agars also aids identification.
teaching support for 2nd year medical school students: steps of the laboratory diagnosis of infections caused by bacteria of the genera Staphylococcus and Streptococcus
The document discusses the Enterobacteriaceae family of gram-negative bacteria. It notes that they are a diverse group that includes many pathogenic genera like Escherichia, Shigella, Salmonella, and Klebsiella. The document covers their characteristics, morphology, identification, growth patterns, antigenic structures, and taxonomy. It provides details on rapid identification of common genera and describes biochemical tests used to differentiate between members of the family.
This document contains slides and information about microbiological testing and identification of various bacteria and fungi. It includes schemes for staining bacteria with and without background staining. It also includes images of various microbes growing on different media like blood agar, chocolate agar and Loffler's serum. Various tests are described like coagulase testing of Staphylococcus, antibiotic sensitivity testing, phage typing and serological testing like Elek's test and tube agglutination testing.
This document provides an overview of Streptococcus bacteria, including characteristics, diseases caused, taxonomy, and methods for identification. Key points include:
- Streptococcus is a genus of spherical, Gram-positive bacteria that grow in chains. It includes over 50 species that are part of normal oral flora but can also cause diseases.
- Major diseases caused by different Streptococcus species include pharyngitis, pneumonia, toxic shock syndrome, and neonatal infections.
- Identification involves examining colony morphology on blood agar plates, microscopic appearance, and biochemical tests like catalase, optochin, and bile esculin tests.
- Classification is based on carbohydrate antigens identified through Lancefield grouping
Staphylococcus is a genus of bacteria that can cause a variety of infections in humans. The most common pathogenic species is Staphylococcus aureus, which was first identified in the late 19th century. S. aureus produces toxins and enzymes that allow it to infect skin, blood, lungs, and other tissues. It commonly causes skin infections like boils and abscesses but can also lead to serious diseases like pneumonia, meningitis, or toxic shock syndrome. Methicillin-resistant S. aureus (MRSA) infections are difficult to treat with many antibiotics. Laboratory tests are used to identify S. aureus from patient samples and test for antibiotic resistance.
Staphylococcus are spherical bacteria that grow in grape-like clusters. S. aureus is an important human pathogen capable of causing a wide range of illnesses from minor skin infections to life-threatening conditions like toxic shock syndrome. It produces many virulence factors like toxins and enzymes. Common infections include impetigo, boils, cellulitis, abscesses, osteomyelitis, pneumonia, and sepsis. Diagnosis involves culture and tests for coagulase and antibiotic resistance. Treatment requires drainage of infections and antibiotic therapy. Prevention focuses on hygiene, safe food handling, and complete treatment of infections.
E. coli is a gram-negative, facultative anaerobic rod that is commonly found in the gut of humans and animals. It has various virulence factors like somatic (O), flagellar (H), capsular (K) antigens and fimbriae that aid in colonization and pathogenesis. Major diseases caused are urinary tract infections, diarrhea, and other infections. Diarrheagenic E. coli are classified into six types based on virulence mechanisms - EPEC, ETEC, EIEC, EHEC/VTEC, EAEC, DAEC. EHEC secretes Shiga toxin/verocytotoxin which can cause hemorrhagic colitis and HUS. U
Stapplococus Bacteria in Medical Microbiologysararazi1508
Staphylococci are a genus of bacteria that can cause a variety of infections in humans. Staphylococcus aureus is one of the most common causes of staph infections. It is a gram-positive coccus that grows in clusters resembling grape clusters. S. aureus produces toxins and enzymes that allow it to infect the skin and deeper tissues. Common infections include impetigo, boils, cellulitis, abscesses, pneumonia, and toxic shock syndrome. Laboratory diagnosis involves culturing samples and identifying colonies based on their morphology, biochemical tests like coagulase production, and antibiotic sensitivity testing. Treatment involves antibiotics, but some strains like MRSA are resistant to many antibiotics.
This document provides information on Corynebacterium and diphtheria. It describes the general characteristics of Corynebacterium bacteria and discusses the species that are pathogenic, like Corynebacterium diphtheriae which causes diphtheria. The pathogenesis of diphtheria is explained, noting how the toxin spreads and affects different body systems. Methods for laboratory diagnosis, treatment with antibiotics and antitoxin, and vaccination against diphtheria are also summarized.
prof . dr. ihsan edan alsaimary
department of microbiology - college of medicine - university of basrah - basrah -IRAQ
ihsanalsaimary@gmail.com
00964 7801410838
This document discusses different types of staphylococci and streptococci bacteria. It provides background on staphylococci, including its classification based on pigment production and pathogenicity. It describes Staphylococcus aureus in more detail, covering its habitat, morphology, factors influencing pigment production, and pathogenicity, causing infections like boils and abscesses. The document also discusses streptococci classification based on oxygen requirement, hemolytic properties on blood agar, and Lancefield grouping. It provides more information on Streptococcus pyogenes and Streptococcus pneumoniae, including characteristics, transmission, pathogenesis, and laboratory diagnosis.
Salmonella is a gram-negative rod-shaped bacteria from the Enterobacteriaceae family. It is classified into two species, Salmonella enterica and Salmonella bongori, with over 2,500 serotypes identified. Salmonella can cause enteric (typhoid) fever through fecal-oral transmission, or gastroenteritis through contaminated food or water. Clinical manifestations depend on the infecting serotype and host factors. Laboratory diagnosis involves culture of blood, bone marrow, or stool to isolate the bacteria. Treatment focuses on hydration and antibiotics such as fluoroquinolones.
Salmonella is a genus of bacteria that can cause illnesses like typhoid fever, paratyphoid fever, and gastroenteritis. There are over 2,400 serotypes of Salmonella. Typhoidal Salmonella like S. typhi and S. paratyphi A cause enteric fever while non-typhoidal Salmonella usually cause food poisoning. Laboratory diagnosis of enteric fever involves culturing the bacteria from blood, feces, or other specimens. Serological tests like the Widal test detect antibodies against Salmonella. Isolates can be identified biochemically and through antigen testing. Vaccines are available to help prevent typhoid fever.
This document summarizes key information about Staphylococcus bacteria. It describes the history of Staphylococcus discovery and classification. It outlines the typical characteristics of Staphylococcus including being gram positive cocci that form clusters and produce catalase. The three main pathogenic species - S. aureus, S. epidermidis, and S. saprophyticus - are identified along with their roles in infection. Methods for laboratory diagnosis including culture-based identification and biochemical tests are also summarized.
The document discusses the classification, identification, and clinical significance of streptococci and enterococci bacteria. It describes how they are classified based on their hemolysis, Lancefield grouping, and other biochemical tests. Key genera include Streptococcus, Enterococcus, and Streptococcus milleri group. Identification involves cultural characteristics, catalase testing, and antibiotic sensitivity patterns. Clinically important species are S. pyogenes (GAS) which can cause strep throat, scarlet fever, and rheumatic fever.
This document provides information on the bacteria Proteus, including its characteristics, virulence factors, infections it causes, identification and treatment. It notes that Proteus is a gram-negative, motile bacillus that is commonly found in the intestines and can cause urinary tract and nosocomial infections. Its main virulence factors include urease production, which allows it to colonize the urinary tract, and fimbriae, which aid in attachment and colonization. Identification involves culturing on media like blood agar where it displays swarming motility and testing for properties such as being urease positive and oxidase negative. Treatment involves antibiotics like beta-lactams, aminoglycosides
1. Staphylococcus are Gram-positive cocci that occur in clusters and can cause a variety of infections through toxins or direct invasion. Common species include S. aureus, S. epidermidis, S. saprophyticus.
2. S. aureus is an important human pathogen capable of causing skin infections, pneumonia, sepsis and toxic shock syndrome. Virulence factors include coagulase, hemolysins and enterotoxins.
3. Laboratory diagnosis involves culturing specimens on selective media, testing for catalase and coagulase production, and antibiotic susceptibility testing. MRSA strains are resistant to multiple
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identificationofbacteria-160517155010.pdf
1. IDENTIFICATION OF
PATHOGENIC BACTERIA IN
CLINICAL MICROBIOLOGY
LABORATORY
G.HARIPRASAD M.Sc.,M.Phil.,Ph.D
Department of Microbiology
Thoothukudi Govt. Medical College
Thoothukudi
2. Identification of Gram Positive Cocci(I)
Staphylococcus species
Gram stain – Gram positive cocci in clusters
Motility – Non-motile
Catalase – Positive
Oxidase – Negative
So it is Staphylococcus
Coagulase Test
Staph. aureus Staph. epidermidis
Staph. saprophyticus
3. Identification of Gram Positive Cocci(I)
Staphylococcus species – cont.,
Novobiocin sensitivity
Resistant sensitive
Staph. Saprophyticus Staph. epidermidis
4. • Differentiation between Staphylococci and Micrococci also
may be important because both may be similar in microscopic
morphology.
TEST MICROCOCCI STAPHYLOCOCCI
OF TEST OXIDATIVE FERMENTATIVE
MODIFIED OXIDASE
TEST
POSITIVE NEGATIVE
BACITRACIN
SUSCEPTIBILITY
SENSITIVE RESISTANT
FURAZOLIDONE
SUSCEPTIBILITY
RESISTANT SENSITIVE
Identification of Gram Positive Cocci(I)
Staphylococcus species- cont.,
5. (contd..)
Note:
Other characteristic features to identify
Staphylococcus aureus
Mannitol fermentation – Positive
DNAase test – Positive
Beta-hemolytic on blood agar
Golden yellow pigment
Mannitol Salt Agar (Selective medium) –
Staph. aureus produce yellow color
colonies due to mannitol fermentation.
6. IDENTIFICATION OF GRAM POSITIVE COCCI (II)
STREPTOCOCCUS
• Gram stain – Gram positive cocci in chains
• Motility – Non-motile
• Catalase – Negative
• Oxidase – Negative
So it is Streptococcus
Pin-point colonies with wide zone of Beta hemolysis
on blood agar (constant property)
May be Beta-hemolytic streptococci like
• Streptococcus pyogenes (Group A streptococci)
• Streptococcus agalactiae (Group B streptococci)
8. IDENTIFICATION OF GRAM POSITIVE COCCI (III)
PNEUMOCOCCUS
• Gram stain – Gram positive cocci in pairs
(lanceolate shape)
• Motility – Non-motile
• Catalase – Negative
• Oxidase – Negative
On blood agar – ALPHA HEMOLYTIC
It may be Streptococcus pneumoniae
(or) Viridans streptococci (though it occur
in chains predominantly sometimes may occur in pairs)
9. Optochin sensitivity test
(Sensitive) (Resistant)
Pneumococcus Viridans streptococci
(Capsulated) (Non-capsulated)
(Bile solubility test - Pos) (Bile solubility test - Neg)
(Capsule swelling test – pos) (Capsule swelling test – Neg)
(Bile Esculin test – Neg) (Bile Esculin Negative)
Note: Because the isolate is Gram positive cocci in pairs, we
may also suspect Enterococcus sp., which may be alpha, beta or
gamma hemolytic pattern on blood agar, hence Bile Esculin
test, to which Enterococcus sp., is positive, can be used.
10. Note:
Pneumococcus – cause of Lobar pneumonia so it is most
likely to be present in sputum of infected person.
Remember pneumococcus is also cause of meningitis ( so
also found in CSF)
Along with sputum, viridans streptococcus, which is a
normal flora in oral cavity, may be present when sputum
contaminated with saliva.
Viridans streptococcus, usually arranged in chains, may
break into pairs looking like Streptococcus pneumoniae.
Viridans streptococcus and Streptococcus pneumoniae
are always alpha-haemolytic.
11. IDENTIFICATION OF GRAM POSITIVE COCCI- IV
ENTEROCOCCUS
• Gram stain – Gram positive cocci in pairs
• Motility – Non-motile
• Catalase – Negative
• Oxidase – Negative
So it may be Enterococcus (or) Pneumococcus
(or) viridans streptococci
12. BILE ESCULIN HYDROLYSIS TEST
Positive Negative
Group D streptococcus Pneumococcus
Enterococcus Viridans streptococci
(Grow in MacConkey’s agar) (Not Grow in MacConkey’s agar)
(Tiny deep pink (LF) colonies)
13. Growth in 6.5% salt
(Salt tolerance test)
Positive (Growth) Negative (No growth)
Enterococcus Group D streptococcus
PYR (+ve) (-ve)
Sensitivity (R) (S)
to SXT
Ability to
grow at 450
C Yes No
14. Note:
Enterococcus can be alpha or beta or gamma
hemolytic on blood agar
Enterococcus faecalis and Enterococcus
faecium are important pathogenic members in
Genus Enterococcus
15. IDENTIFICATION OF GRAM NEGATIVE COCCI (I)
NEISSERIA SPECIES
• Gram Stain – Gram negative diplococci
• Motility – Non- motile
• Catalase – Positive
• Oxidase – Positive
So it may be
Pathogenic Neisseria (or) Non-pathogenic Neisseria
(Neisseria gonorrhoeae) (Neisseria flavescens)
(Neisseria meningitidis) (Neisseria sicca)
(Neisseria subflava)
16. Growth on THAYER-MARTIN MEDIUM (selective medium)
Growth No growth
Neisseria gonorrhoeae Neisseria flavescens
Neisseria meningitidis Neisseria sicca
Neisseria subflava
Glucose (+ve) Glucose (+ve)
Maltose (-ve) Maltose (+ve)
N. gonorrhoeae N. meningitidis
17. Note:
•Non-pathogenic Neisseria like N. flavescens,
N. sicca & N. subflava produce yellow pigment
•Non-pathogenic Neisseria can grow on
Nutrient agar but pathogenic Neisseria don’t.
•Catalase test for Neisseria can be done by
superoxol test using 30% Hydrogen peroxide.
•N. gonorrhoeae – most likely to be present in
urethral pus.
•N. meningitidis – most likely to be present in
CSF.
18. IDENTIFICATION OF GRAM POSITIVE BACILLI
List of Gram positive Bacilli
Corynebacterium sp.
Listeria sp.
Erysipelothrix rhusiopathiae
Lactobacillus sp.
Kurthia sp.
Actinomyces sp.
Bacillus sp.
Clostridium sp.
24. Note:
Other examples of anaerobic Gram positive bacilli –
Eubacterium, Propionibacterium, Bifidobacterium,
Mobilincus.
Remember, Actinomyces and Lactobacillus also
contains anaerobic species and microaerophilic
species.
Clostridium species (anaerobes) – another example of
Gram positive bacilli
Diptheroids, morphologically similar to C. diptheriae
can grow on ordinary media like Nutrient agar. But
Corynebacterium diptheriae can only grow on
enriched media like Blood agar and Loeffler serum
slope.
25. IDENTIFICATION OF GRAM NEGATIVE BACILLI
(I)
ESCHERICHIA COLI /E.COLI
• Gram stain – Gram negative bacilli
• Motility – Motile
• Catalase – Positive
• Oxidase – Negative
So it is one of the members of
Enterobacteriaceae
Enterobacteriaceae includes E.coli, Klebsiella,
Citrobacter, Enterobacter, Serratia, Salmonella,
Shigella, Proteus
26. MacConkey’s agar – Dry, flat LF colonies
Motility – Motile
So it may be E.coli, Citrobacter, Enterobacter,
Serratia
Klebsiella being non-motile, it is omitted
Indole test
Methyl-Red test
(+) (-)
E.coli Enterobacter
Citrobacter
28. IMVIC REACTIONS FOR E.COLI
•Indole – (+)
•Methyl red – (+)
•Voges-Proskauer – (-)
•Citrate - (-)
Other biochemical reactions:
TSI – A/A, Gas (+), H2S (-)
Urease – (-)
Remember:
E.Coli is the most commones cause of lower urinary
tract infection. In this case, E.coli is most likely to be
present in urine sample of infected persons.
29. IDENTIFICATION OF GNB (II)
KLEBSIELLA SPECIES
• Gram stain – Gram Negative bacilli
• Motility – Non-motile
• Catalase – Positive
• Oxidase – Negative
So it is one of the members of
Enterobacteriaceae
30. On MacConkey’s agar – Mucoid LF Colonies
Motility – Non-motile
So it may be Klebsiella species
But it may not be E.coli, Citrobacter,
Enterobacter or Serratia ( because all are
motile)
Klebsiella species
Klebsiella pneumoniae
Klebsiella oxytoca
Klebsiella rhinoscleromatis
Klebsiella ozanae
33. IMVIC REACTIONS FOR KLEBSIELLA PNEUMONIAE
•Indole – (-)
•Methyl red – (-)
•Voges-Proskauer – (+)
•Citrate - (+)
Other biochemical reactions:
TSI – A/A, Gas (+), H2S (-)
Urease – (+)
Remember:
Klebsiella pneumoniae is also the most commonest
cause of lower urinary tract infection. In this case, it is
most likely to be present in urine sample of infected
persons.
34. IDENTIFICATION OF GNB (III)
CITROBACTER
• Gram stain – Gram negative bacilli
• Motility – Motile
• Catalase – Positive
• Oxidase – Negative
So it is one of the members of Enterobacteriaceae
On Mac – LF colonies
Being motile
It may be E.coli or Enterobacter or Citrobacter
38. Other reactions of Citrobacter
•Indole – (+/-)
•MR – (+)
•VP – (-)
•Urease – (weakly positive)
•TSI – A/A, Gas (+ve), H2S (+/-)
Remember citrobacter sometimes also may be
Late lactose fermenter ( ONPG – +VE)
Remember Citrobacter always Citrobacter (+)
39. IDENTIFICATION OF GNB (IV)
ENTEROBACTER
• Gram stain – Gram Negative Bacilli
• Motility – Motile
• Catalase – Positive
• Oxidase – Negative
So it is one of the members of Enterobacteriaceae
On Mac- LF colonies (Less mucoid)
Being motile
It may be E.coli (or) Citrobacter (or) Enterobacter
42. IDENTIFICATION OF GNB-V
PROTEUS, MORGANELLA, PROVIDENCIA
• Gram stain – Gram negative bacilli
• Motility –Motile
• Catalase – Positive
• Oxidase – Negative
So it is one of the members of
Enterobacteriaceae
Being motile – Shigella is omitted
On Mac – NLF – so E.coli, Citrobacter, Enterobacter
are omitted
43. • It may be Salmonella or Proteus or
Morganella or Providencia
Being PPA/PAD test positive
It may not be Salmonella
It may be Proteus (or) Morganella (or) Providencia
Swarming on Blood agar
(+) (-)
Proteus Providencia
Morganella
44. Proteus species
Indole test
(+) (-)
Proteus vulgaris Proteus mirabilis
(Ornithine decarboxylase (+)) (Ornithine decarboxylase (-))
48. Other biochemicals for Proteus species
MR – (+)
VP – (-)
Urease - (+)
Citrate – (-)
TSI – K/A, Gas(+), H2S (+)
49. IDENTIFICATION OF GNB – VI
SHIGELLA SPECIES
• Gram stain – Gram negative bacilli
• Motility – Non-motile
• Catalase – Positive
• Oxidase – Negative
so it is one of the members of enterobacteriaceae
On mac – NLF colonies
Being non-motile
It is not Salmonella (or) Proteus (being motile)
It is Shigella species
52. Note:
Shigella dysenteriae type 1 is always catalase
negative.
Differentiation between
Sh. Flexneri and Sh. Boydii can be done
only by serological method using specific
antisera because of non-availability of suitable
biochemical reactions.
53. Other biochemicals for Shigella species
Indole – (+/-)
MR – (+)
VP – (-)
Citrate – (-)
Urease – (-)
TSI – K/A, Gas (-), H2S (-)
54. IDENTIFICATION OF GNB – VII
SALMONELLA SPECIES
• Gram stain – Gram negative bacilli
• Motility – Motile
• Catalase – Positive
• Oxidase – Negative
So it is one of the members of Enterobacteriaeceae
On Mac – NLF colonies
Being motile
It may not be Shigella (being non-motile)
It may be Salmonella or Proteus
55. PPA/PDA
(+) (-)
Proteus sp. Salmonella sp.
(Swarming on BA (+)) (Swarming on BA (-))
S. typhi
S. paratyphi A
S. paratyphi B
56. H2S Production
(+) (-)
S. typhi S. paratyphi A
S. paratyphi B
Gas production
(-) (+)
S. typhi S. paratyphi B
57. Another way of differentiation of Salmonella
species
•Remember S. paratyphi B alone is citrate
positive.
•Remember S. paratyphi A and S. paratyphi B
both are xylose and arabinose positive
•Remember S. typhi is both xylose and
arabinose negative.
58. Differentiation of Salmonella species
also may be possible by TSI reaction
S. typhi
K/A, Gas (-), speck of H2S (+)
S. paratyphi A
K/A, Gas (+), H2S (-)
S. paratyphi B
K/A, Gas (+), abundant H2S (+)
59. Other biochemicals for Salmonella species
Indole – (-)
MR – (+)
VP – (-)
Citrate – (only S. paratyphi B positive)
Urease – (-)
60. IDENTIFICATION OF GNB – VIII
PSEUDOMONAS SPECIES
• Gram stain – Gram negative bacilli
• Motility – Motile
• Catalase – Positive
• Oxidase – Positive
So it is one of the members of
Non-enterobacteriaeceae like
Pseudomonas species
Vibrio species
61. On MAC – NLF colonies (irregular)
On NA – Bluish green (pyocyanin) pigmentation
OF –TEST – Oxidative reaction seen
It is more likely to be Pseudomonas aeruginosa
(because it is only pseudomonas species
produce such type of bluish green pigment)
It may not be Vibrio species because it is
fermentative in OF-TEST and not produce
bluish green pigment
62. Other biochemicals for Pseudomonas aeruginosa
Indole – (-)
MR – (-)
VP – (-)
Citrate – (+)
Urease – (-)
TSI - K/K (or) K/no change, Gas (-), H2S (-)
Nitrate reduction test – (+)
63. IDENTIFICATION OF GNB – IX
VIBRIO AND ASSOCIATED SPECIES
• Gram stain – Gram negative bacilli
• Motility – Motile (Darting motility)
• Catalase – Positive
• Oxidase – Positive
So it is one of the members of
Non- Enterobacteriaeceae
It may be Vibrio (or) Aeromonas (or) Plesiomonas
It may not Pseudomonas because no bluish green
pigment seen
68. Specific tests for Vibrio cholerae
String test – (+)
Cholera Red Reaction – (+)
Gelatin liquefaction – (+)
_____________________________
Other reactions of Vibrio cholerae
MR – (-)
VP – (+/-)
Citrate (+)
Urease – (-)
TSI – A/A, Gas (-), H2S (-)
69. Serotyping of Vibrio cholerae
Vibrio cholerae 01 antiserum helps to identify
Vibrio cholerae O1 strain. This is followed by
identification of specific subtypes like Inaba
(or) Ogawa (or) Hikojima by using specific
antisera.
70. • This presentation was created for those who
are working as a laboratory
technician/technologist in clinical
microbiology diagnostics.
• Also may find useful for UG, PG, DMLT,
PGDMLT in Microbiology.
Mail ID:
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