2. Definition
An infectious feverish disease caused by the bacterium Salmonella
typhi(Salmonella enterica Serovar Typhi ) and less commonly by Salmonella
paratyphi.
Acute generalized infection of the reticulo endothelial system, intestinal
lymphoid tissue, and the gall bladder.
The infection always comes from another human, either an ill person or a
healthy carrier of the bacterium. The bacterium is passed on with water and
foods and can withstand both drying and refrigeration.
Typhos in Greek means ,smoke and typhus fever got its name from smoke that
was believed to cause it. Typhoid means typhus-like and thus the name given
to this disease.
3. History
Antonius Musa, a Roman physician who
achieved fame by treating the Emperor
Augustus 2,000 year ago, with cold baths
when he fell ill with typhoid.
Thomas Willis who is credited with the first
description of typhoid fever in 1659.
4. French physician Pierre Charles Alexandre Louis
first proposed the name “typhoid fever”
William Wood Gerhard who was the first
to differentiate clearly between typhus
fever and typhoid in 1837.
5. Carl Joseph Eberth who discovered the
typhoid bacillus in 1880.
Georges Widal who described the
‘Widal agglutination reaction’
of the blood in 1896.
6. In 1906, Irish immigrant Mary Mallon worked as a cook in the Oyster Bay
summer home of New York banker Charles Henry Warren and his family. By the
end of the summer, six members of the household had contracted typhoid
fever. The Warrens hired sanitary engineer, George Soper, to determine the
source of the disease. Soper concluded that Mallon, while immune herself to the
disease, was its carrier. For three years, she was isolated on North Brother
Island, near Rikers Island, earning the nickname "Typhoid Mary" Instructed not
to cook for others upon her release, she nevertheless changed her name and
became a cook at a maternity hospital in Manhattan. At least 25 staff members
contracted typhoid. "Typhoid Mary" returned to North Brother Island, where
she lived alone for 23 years, until her death in 1938. She is shown here on the
island in an undated photo. She died of a stroke after 23 years in quarantine.
9. According to the World Health Organization, globally some
21.6 million cases occur annually resulting in more than
2,00,000 deaths. More than 62% of the global cases occur in
Asia, of which, 7 million occur annually in South East Asia.
Other countries with a high incidence include Central and
South America, Africa and Papua New Guinea.
Highest in Pakistan & India in Asian countries (451.7 per
100,000)
10. INDIA
World largest outbreak of typhoid in SANGLI on December
1975 to February 1976 . This disease is endemic in India.
Case fatality rate due to typhoid has been varying between
1.1% to 2.5 % in last few years.
12. Salmonellae typhi
Salmonellae typhae are gram – ve rods, facultative aerobic, Motile
with peritrichate flagella, non-spore-forming
1-3μm ×0.5μm in size
Salmonella currently comprise 2000 serotypes
Two groups a) Enteric fever group
b) Food poisoning group
S. typhi are able to survive in a stomach pH as low as 1.5.
Antacids, (H2 blockers), PPI’s, gastrectomy, facilitate S typhi infection
The bacteria grows best at 37°C & are killed at 55ºc in one hour or at
60ºc in 15 minutes.
Boiling or chlorination of water and pasteurization of milk destroy the
bacilli
The proportion of typhoid to paratyphoid A is 10:1, Paratyphoid B is
rare and paratyphoid C is very rare in India
13. Host Factors
Age - occur at any age but highest incidence in 5-19 yrs age
group.
Sex - cases more in Males than Female carrier rate is more in
females
Immunity - antibody may be stimulated by infection or
immunization. Antibody against (O) antigen is higher in
patient with the disease and antibody against (H) antigen is
higher in immunized person. S.Typhi is intracellular
organism so cell mediated immunity plays a major role in
combating the infection.
14. Environmental & Social Factors
Typhoid fever regarded as “Index of general sanitation” in any country.
Increase incidence in July-September.
Outside human body bacilli found in
Water - 2 to 7 days but not multiply
Soil irrigated with sewage - 35 to 70 days
Ice & ice cream - over a month
Food - multiply & survive for sometime
Milk - grow rapidly without altering its taste
Vegetables grow in sewage plant.
Pollution of drinking water supplies.
Open area defecation & urination.
Low personal hygiene.
Health ignorance.
15. Incubation Period
Usually 10-14 days but it may be as short as 3 days or as
long as 21 days depending upon the dose of the bacilli
ingested.
16. 1. Faeco - oral route
either directly through hands soiled with faeces or urine of cases or
carriers or indirectly by ingestion of contaminated water, milk, food,
or through flies. Contaminated ice, ice-creams, and milk products are
a rich source of infection.
2. Droplet Infection
3. By Carriers
Mode of transmission
19. Ingestion of contaminated food or water
Salmonella bacteria
Invade small intestine and enter the bloodstream
Carried by white blood cells in the liver, spleen, and bone marrow
Multiply and reenter the bloodstream
Bacteria invade the gallbladder, biliary system, and the lymphatic tissue of
the bowel and multiply in high numbers
Then pass into the intestinal tract and can be identified for diagnosis in
cultures from the stool tested in the laboratory
Pathogenesis
20. Source of infection
Primary sources
Faeces & urine of cases and
carriers.
Faecal carriers are more
frequent than urinary
carriers.
Secondary sources
Contaminated
Water
Food
Fingers
Flies
22. First Week : Symptoms
Step-ladder rise in temperature (40 - 41°C) over 4 to 5 days
Diffuse abdominal pain
Inflamed Peyer’s patches narrow the lumen
Constipation
Dry cough
dull frontal headache
delirium
increasingly Stupor
malaise
23. First Week : Other Symptoms
Rose spots
Blanching
Truncal
Maculopapules
usually 1-4 cm wide,
< 5 in number;
generally resolve within 2-5 days
(bacterial emboli to the dermis)
25. Second Week
Distended abdomen
Soft Hepato-splenomegaly
Relative Bradycardia & dicrotic pulse
(double beat, the second beat weaker than the first)
26. Third Week : Typhoid State
Patient may descend into the Typhoid State
Apathy
Confusion
Psychosis
27. Third Week : Complications
Necrotic Peyer’s patches
Bowel perforation
Peritonitis
Intestinal hemorrhage
May cause death
28. Fourth Week : Convalescence
Fever
Mental Confusion,
Abdominal Distension slowly improve over a few
days,
Complications may still occur in surviving
untreated individuals
29. Rose spots High fever
Diarrhea Typhoid Meningitis
Aches and pains
Chest congestion
Some Common Symptoms
31. Diagnosis
Diagnosis of typhoid fever is made by
Blood, bone marrow, or stool cultures test
Widal test
Antimicrobial susceptibility testing
32. Diagnosis acc. to Week
First Week
Blood Culture, Bone Marrow Culture
Second Week
Antibody Detection (Widal Test)
Third Week
Stool Culture
Fourth Week
Urine Culture
33. Widal test
" A test involving agglutination of typhoid bacilli when they are mixed
with serum containing typhoid antibodies from an individual having
typhoid fever; used to detect the presence of Salmonella typhi and S.
paratyphi."
34. How do you read
Widal test results for typhoid fever?
The highest dilution of the patients serum in which agglutinations occurs is
noted, ex. if the dilution is 1 in 120 then the titer is 129.
Agglutination in dilution up to <1:60 is seen in normal individuals .
Agglutination in dilution 1:160 is suggestive of Salmonella infection.
Agglutination in dilution of and more than 1:360 is confirmatory of Enteric
fever .
35. NEW DIAGNOSTIC TESTS
IDL Tubex detects IgM09 antibodies with in few minutes
Typhidot test that detects presence of IgM and IgG in one hour
(sensitivity>95%, Specificity 75%)
Typhidot-M, that detects IgM only (sensitivity 90% and specificity
93%)
Typhidot rapid (sensitivity 85% and Specificity 99%) is a rapid 15
minute immunochromatographic test to detect IgM.
IgM dipstick test
37. Prevention
1. Vaccination
First type of vaccine:
Contains killed Salmonella typhi bacteria.
Administered by a shot.
Second type of vaccine:
Contains a live but weakened strain of the Salmonella bacteria that causes typhoid
fever.
Taken by mouth.
Be vaccinated against typhoid while traveling to a country where typhoid is
common.
Need to complete your vaccination at least one week before travel.
Typhoid vaccines lose their effectiveness after several years so check with your
doctor to see if it is time for a booster vaccination.
38. 2. Avoid risky food and drinks
Buy bottled drinking water or bring it to a rolling boil for one minute
before drinking it.
Ask for drinks without ice, unless the ice is made from bottled or boiled
water. Avoid Popsicles and flavored ices.
Eat food that have been thoroughly cooked and that are still hot and
steaming.
Avoid raw vegetables and food that cannot be peeled like lettuce.
When eat raw fruit and vegetables that can be peeled, peel yourself.
Don’t eat the peelings.
Avoid foods and beverages from street vendors.
39. Treatment
Conservative
An infectious disease specialist or surgeon should be consulted.
Oral or IV Medications
Surgical
Usually indicated in cases of intestinal perforation.
Most surgeons prefer simple closure of the perforation with drainage of the
peritoneum.
Small-bowel resection is indicated for patients with multiple perforations.
If antibiotic treatment fails to eradicate the hepatobiliary carriage, the
gallbladder should be resected.
Cholecystectomy is not always successful in eradicating the carrier state
because of persisting hepatic infection.
40. If peritonitis seems to be localized, signs
confined to only part abdomen, general
condition is good, patient not deteriorating,
consider non-operative treatment.
CONSERVATIVE SURGICALvs
If signs of generalized peritonitis,
do a laparotomy
41. Diet
Fluids and electrolytes should be monitored and replaced diligently.
Oral nutrition with a soft digestible diet is preferable in the absence of
abdominal distension or ileus.
Activity
No specific limitations on activity are indicated.
Rest is helpful, but mobility should be maintained if tolerable.
The patient should be encouraged to stay home from work until recovery.
42. Antibiotics
Antibiotics, such as ampicillin, chloramphenicol, fluoroquinolone
trimethoprim-sulfamethoxazole, Amoxicillin, Azithromycin and
ciprofloxacin etc used to treat typhoid fever.
Prompt treatment of the disease with antibiotics reduces the
case-fatality rate to approximately 1%.
Medication
45. Misdiagnosis
Paratyphoid fever- similar to typhoid fever but usually less severe.
Paraenteric fever- a typhoid-like fever but not caused by Salmonella.
Gastroenteritis- mild case of typhoid fever may be mistaken for gastroenteritis.
Typhomalarial fever
Brucellosis
Tuberculosis
Infective endocarditis
Q fever
Rickettsial infections
Acute diarrhea (type of Diarrhea)
Viral Hepatitis
Lymphoma
Adult Still's disease
Malaria