This document summarizes several zoonotic protozoan diseases. It discusses Toxoplasmosis, caused by Toxoplasma gondii, noting cats are the definitive host and transmission can occur congenitally or through undercooked meat. African trypanosomiasis, or sleeping sickness, is transmitted by tsetse flies and caused by Trypanosoma brucei, while American trypanosomiasis, or Chagas disease, is transmitted by triatomine bugs and caused by Trypanosoma cruzi. Symptoms, diagnosis, treatment and prevention are outlined for each disease.
Important Zoonotic disease and its prevention and control By: Dr.Manoj karkimanojj123
Zoonosis are those disease and infection which are naturally transmitted between animals and human. (WHO & FAO, 1959).
Zoonosis word derived from Greek word “ZOO” means Animals and “NOSES” means Disease.
One Health is not a new concept, but it has become more important in recent years because many factors have changed the interaction among human, animals and the environment. These changes have caused the emergence and re-emergence of many disease.
Final project for my class in Parasitology. Designed to fit with other medical brochures at the veterinarian's office. Provides useful information for pet owners regarding Toxocara parasites.
Important Zoonotic disease and its prevention and control By: Dr.Manoj karkimanojj123
Zoonosis are those disease and infection which are naturally transmitted between animals and human. (WHO & FAO, 1959).
Zoonosis word derived from Greek word “ZOO” means Animals and “NOSES” means Disease.
One Health is not a new concept, but it has become more important in recent years because many factors have changed the interaction among human, animals and the environment. These changes have caused the emergence and re-emergence of many disease.
Final project for my class in Parasitology. Designed to fit with other medical brochures at the veterinarian's office. Provides useful information for pet owners regarding Toxocara parasites.
Zoonoses :- derived from the Greek words
Zoon- Animal & Noson – Disease
Zoonoses was coined and first used by Rudolf Virchow who defined it for communicable diseases.
Diseases and infections which are naturally transmitted between vertebrate animals and humans - WHO 1959
Of the 1415 microbial diseases affecting humans, 61% are zoonotic with 13% species regarded as emerging or reemerging
Link b/w human & animals with their surrounding are very close especially in developing countries
This is the presentation on Trypanosomiasis that covers classification and diseases caused by Trypanosoma, its life cycle, Geographical distribution, Transmission, diagnosis and treatment and finally its scenario in India.
Some flow charts have been taken from published articles, that can be searched directly from net.
GEMC - Parasitic Infections - for NursesOpen.Michigan
This is a lecture by Katherine A Perry from the Ghana Emergency Medicine Collaborative. To download the editable version (in PPT), to access additional learning modules, or to learn more about the project, see http://openmi.ch/em-gemc. Unless otherwise noted, this material is made available under the terms of the Creative Commons Attribution Share Alike-3.0 License: http://creativecommons.org/licenses/by-sa/3.0/.
Zoonoses :- derived from the Greek words
Zoon- Animal & Noson – Disease
Zoonoses was coined and first used by Rudolf Virchow who defined it for communicable diseases.
Diseases and infections which are naturally transmitted between vertebrate animals and humans - WHO 1959
Of the 1415 microbial diseases affecting humans, 61% are zoonotic with 13% species regarded as emerging or reemerging
Link b/w human & animals with their surrounding are very close especially in developing countries
This is the presentation on Trypanosomiasis that covers classification and diseases caused by Trypanosoma, its life cycle, Geographical distribution, Transmission, diagnosis and treatment and finally its scenario in India.
Some flow charts have been taken from published articles, that can be searched directly from net.
GEMC - Parasitic Infections - for NursesOpen.Michigan
This is a lecture by Katherine A Perry from the Ghana Emergency Medicine Collaborative. To download the editable version (in PPT), to access additional learning modules, or to learn more about the project, see http://openmi.ch/em-gemc. Unless otherwise noted, this material is made available under the terms of the Creative Commons Attribution Share Alike-3.0 License: http://creativecommons.org/licenses/by-sa/3.0/.
Zoonoses (Greek “zoon” = animal) are the diseases or infections that are naturally transmissible from vertebrate animals to humans. This group of infections constitutes significant burdens on global public health. The World Health Organisation (WHO) estimates that 25% of the total 57 million annual deaths that occur globally are caused by microbes with a major proportion occurring in the developing world (Chugh, 2008). Of total identified 1,415 species of infectious organisms known to be pathogenic to humans (including 217 viruses and prions, 538 bacteria and rickettsia, 307 fungi, 66 protozoa and 287 helminths), zoonotic agents constitute 868 (61%), with humans serving as the primary reservoir for only 3% of them. Of the 175 diseases considered to be emerging, 132 (75%) are zoonotic in origin (Taylor et al., 2001). In low income countries, established and emerging zoonoses make up 26 % of the DALYs (Disability-adjusted life year) lost to infectious disease and 10 % of the total DALYs lost. In contrast, in high income countries it represent < 1 % of DALYs lost to infectious disease and only 0.02 % of the total disease burden (Grace et al., 2012).
Vectors are living organisms that can transmit infectious diseases between humans or from animals to humans. Vector-borne diseases are infections transmitted by the bite of infected arthropod species, such as mosquitoes, ticks, triatomine bugs, flies, fleas, sandflies, and blackflies (Confalonieri et al., 2007). Among these mosquitoes are the best known disease transmission vectors for many of the fatal and diseases of economic burden. Vector-borne diseases account for 17% of the estimated global burden of all infectious diseases (CDC, 2014). Every year > 1 billion people are infected and > 1 million people die from vector-borne diseases including malaria, dengue, schistosomiasis, leishmaniasis, yellow fever, lymphatic filariasis, Japanese encephalitis and onchocerciasis. One sixth of the illness and disability suffered worldwide is due to vector-borne diseases with more than half the world’s population currently estimated to be at risk of these diseases. Global trade, rapid international travel, unsustainable urbanization, environmental changes such as climate change and emerging insecticidal and drug resistances, are causing vectors and vector-borne diseases to spread beyond borders (WHO, 2014).
Microscopic animal
Microscopic Algae
Bacteria
Microfossil of uncertain effinities
Microfossil elements of smaller animal
Microfossil fragments of larger organism
Anatomy of Protozoa: Basic structure of protozoan cell. Major organelles protozoan cells and their function. Reproduction and and locomotion in Protozoans.
etiology, local names, definition, transmission, source of infection, epidemiology, pathogenesis, clinical signs, diagnosis, differential diagnosis, treatment prevention and control
Visceral leishmaniasis is spread by sandfly bites. This type of leishmaniasis affects the internal organs, usually the spleen, liver and bone marrow.
Some people have no symptoms. For others, symptoms may include fever, weight loss and swelling of the spleen or liver.
Toxoplasmosis is considered one of the neglected parasitic infections of the United States, a group of five parasitic diseases that have been targeted by CDC for public health action.Q fever is a disease caused by the bacteria Coxiella burnetii. This bacteria naturally infects some animals, such as goats, sheep, and cattle. C. burnetii bacteria are found in the birth products (i.e. placenta, amniotic fluid), urine, feces, and milk of infected animals.
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
The increased availability of biomedical data, particularly in the public domain, offers the opportunity to better understand human health and to develop effective therapeutics for a wide range of unmet medical needs. However, data scientists remain stymied by the fact that data remain hard to find and to productively reuse because data and their metadata i) are wholly inaccessible, ii) are in non-standard or incompatible representations, iii) do not conform to community standards, and iv) have unclear or highly restricted terms and conditions that preclude legitimate reuse. These limitations require a rethink on data can be made machine and AI-ready - the key motivation behind the FAIR Guiding Principles. Concurrently, while recent efforts have explored the use of deep learning to fuse disparate data into predictive models for a wide range of biomedical applications, these models often fail even when the correct answer is already known, and fail to explain individual predictions in terms that data scientists can appreciate. These limitations suggest that new methods to produce practical artificial intelligence are still needed.
In this talk, I will discuss our work in (1) building an integrative knowledge infrastructure to prepare FAIR and "AI-ready" data and services along with (2) neurosymbolic AI methods to improve the quality of predictions and to generate plausible explanations. Attention is given to standards, platforms, and methods to wrangle knowledge into simple, but effective semantic and latent representations, and to make these available into standards-compliant and discoverable interfaces that can be used in model building, validation, and explanation. Our work, and those of others in the field, creates a baseline for building trustworthy and easy to deploy AI models in biomedicine.
Bio
Dr. Michel Dumontier is the Distinguished Professor of Data Science at Maastricht University, founder and executive director of the Institute of Data Science, and co-founder of the FAIR (Findable, Accessible, Interoperable and Reusable) data principles. His research explores socio-technological approaches for responsible discovery science, which includes collaborative multi-modal knowledge graphs, privacy-preserving distributed data mining, and AI methods for drug discovery and personalized medicine. His work is supported through the Dutch National Research Agenda, the Netherlands Organisation for Scientific Research, Horizon Europe, the European Open Science Cloud, the US National Institutes of Health, and a Marie-Curie Innovative Training Network. He is the editor-in-chief for the journal Data Science and is internationally recognized for his contributions in bioinformatics, biomedical informatics, and semantic technologies including ontologies and linked data.
Slide 1: Title Slide
Extrachromosomal Inheritance
Slide 2: Introduction to Extrachromosomal Inheritance
Definition: Extrachromosomal inheritance refers to the transmission of genetic material that is not found within the nucleus.
Key Components: Involves genes located in mitochondria, chloroplasts, and plasmids.
Slide 3: Mitochondrial Inheritance
Mitochondria: Organelles responsible for energy production.
Mitochondrial DNA (mtDNA): Circular DNA molecule found in mitochondria.
Inheritance Pattern: Maternally inherited, meaning it is passed from mothers to all their offspring.
Diseases: Examples include Leber’s hereditary optic neuropathy (LHON) and mitochondrial myopathy.
Slide 4: Chloroplast Inheritance
Chloroplasts: Organelles responsible for photosynthesis in plants.
Chloroplast DNA (cpDNA): Circular DNA molecule found in chloroplasts.
Inheritance Pattern: Often maternally inherited in most plants, but can vary in some species.
Examples: Variegation in plants, where leaf color patterns are determined by chloroplast DNA.
Slide 5: Plasmid Inheritance
Plasmids: Small, circular DNA molecules found in bacteria and some eukaryotes.
Features: Can carry antibiotic resistance genes and can be transferred between cells through processes like conjugation.
Significance: Important in biotechnology for gene cloning and genetic engineering.
Slide 6: Mechanisms of Extrachromosomal Inheritance
Non-Mendelian Patterns: Do not follow Mendel’s laws of inheritance.
Cytoplasmic Segregation: During cell division, organelles like mitochondria and chloroplasts are randomly distributed to daughter cells.
Heteroplasmy: Presence of more than one type of organellar genome within a cell, leading to variation in expression.
Slide 7: Examples of Extrachromosomal Inheritance
Four O’clock Plant (Mirabilis jalapa): Shows variegated leaves due to different cpDNA in leaf cells.
Petite Mutants in Yeast: Result from mutations in mitochondrial DNA affecting respiration.
Slide 8: Importance of Extrachromosomal Inheritance
Evolution: Provides insight into the evolution of eukaryotic cells.
Medicine: Understanding mitochondrial inheritance helps in diagnosing and treating mitochondrial diseases.
Agriculture: Chloroplast inheritance can be used in plant breeding and genetic modification.
Slide 9: Recent Research and Advances
Gene Editing: Techniques like CRISPR-Cas9 are being used to edit mitochondrial and chloroplast DNA.
Therapies: Development of mitochondrial replacement therapy (MRT) for preventing mitochondrial diseases.
Slide 10: Conclusion
Summary: Extrachromosomal inheritance involves the transmission of genetic material outside the nucleus and plays a crucial role in genetics, medicine, and biotechnology.
Future Directions: Continued research and technological advancements hold promise for new treatments and applications.
Slide 11: Questions and Discussion
Invite Audience: Open the floor for any questions or further discussion on the topic.
Nutraceutical market, scope and growth: Herbal drug technologyLokesh Patil
As consumer awareness of health and wellness rises, the nutraceutical market—which includes goods like functional meals, drinks, and dietary supplements that provide health advantages beyond basic nutrition—is growing significantly. As healthcare expenses rise, the population ages, and people want natural and preventative health solutions more and more, this industry is increasing quickly. Further driving market expansion are product formulation innovations and the use of cutting-edge technology for customized nutrition. With its worldwide reach, the nutraceutical industry is expected to keep growing and provide significant chances for research and investment in a number of categories, including vitamins, minerals, probiotics, and herbal supplements.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
A brief information about the SCOP protein database used in bioinformatics.
The Structural Classification of Proteins (SCOP) database is a comprehensive and authoritative resource for the structural and evolutionary relationships of proteins. It provides a detailed and curated classification of protein structures, grouping them into families, superfamilies, and folds based on their structural and sequence similarities.
4. Obligate intracellular parasite
Definitive host – cats
Intermediate hosts – sheep, goats, pigs, humans
All warm-blooded animals, including mammals and birds
Second commonest opportunistic infection inAIDS patients, with
as high as 75 % mortality
6. In INDIA…
The prevalence of toxoplasmosis in India was as high as 77%
in women of reproductive age
IgG and IgM antibodies were found in 24.3% and 2% of the
samples, respectively
A higher prevalence ofT. gondii infection has been recorded
in women belonging to low socio-economic groups
(Dumne et.al,2007)
7. Higher seroprevalence was observed in pigs (14.0%), sheep
(7.9%), goats (8.8%) and camels (7.5%)
The prevalence ofT. gondii in cats (2.5%) is low when
compared with that inWestern countries
The incubation period is uncertain but probably ranges from
5–23 days in humans
8. PATHOPHYSIOLOGY
There are three infective stages of T. gondii:
Rapidly dividing invasive tachyzoite
Slowly dividing bradyzoite in tissue cysts
Environmental stage, the sporozoite, protected inside an
oocyst
12. Contd….
Toxoplasmosis can be transmitted transplacentally if the mother
becomes infected during pregnancy or if immunosuppression
reactivates a prior infection.
Transmission ofToxoplasma to a fetus is extraordinarily rare in
immunocompetent mothers who have had toxoplasmosis earlier
in life.
Past infection confers resistance to reinfection.
13. DISEASE IN MAN
Acute toxoplasmosis
CNS toxoplasmosis
Congenital toxoplasmosis
Ocular toxoplasmosis
Disseminated or non-CNS disease in immunocompromised
patients
14. ACUTE TOXOPLASMOSIS
Asymptomatic
10 to 20% of patients develop bilateral, nontender cervical
or axillary lymphadenopathy.
Mild flu-like syndrome of fever, malaise, myalgia,
hepatosplenomegaly
Self-limited.
15. CNS TOXOPLASMOSIS
Most patients withAIDS or other immunocompromised
patients with encephalitis
Headache, altered mental status, seizures, coma, fever
Focal neurologic deficits, such as motor or sensory loss,
cranial nerve palsies, visual abnormalities, focal seizures.
16. CONGENITAL TOXOPLASMOSIS:
Spontaneous abortion, stillbirth, birth defects
The percentage of surviving fetuses born with toxoplasmosis
depends on when maternal infection is acquired
15% during the 1st trimester
30% during the 2nd
60% during the 3rd.
Most infants born to mothers infected during the 3rd trimester
appear healthy at birth but are at high risk of seizures,
intellectual disability, retinochoroiditis
17. Disease in neonates - severe, particularly if acquired early in
pregnancy; - jaundice, rash, hepatosplenomegaly
Characteristic tetrad of abnormalities: bilateral
retinochoroiditis, cerebral calcifications, hydrocephalus or
microcephaly and psychomotor retardation.
Prognosis is poor.
18. OCULAR TOXOPLASMOSIS
This type usually results from congenital infection that is
reactivated, often during the teens and 20s, but rarely, it
occurs with acquired infections.
Focal necrotizing retinitis
Secondary granulomatous inflammation of the choroid
Ocular pain, blurred vision, sometimes blindness.
19. DISSEMINATED INFECTION AND NON-
CNS INVOLVEMENT:
Less common
Primarily in severely immunocompromised patients.
Pneumonitis, myocarditis, polymyositis, diffuse
maculopapular rash, high fevers, chills, and prostration.
Untreated disseminated infections are usually fatal.
20. DISEASE IN CATS
Most postnatally acquired infections in cats are
ASYMPTOMATIC.
Prepatent period variable - 3 days to several weeks.
Shedding occurs for 1-2 weeks
21. DIAGNOSIS:
Sabin- Feldman DyeTest: most sensitive test, but rarely used.
IFA
Latex agglutination test
ELISA.
MRI
Brain biopsy
Tachyzoites in blood or body fluids confirms active infection.
22. SABIN-FELDMAN DYE TEST
Live tachyzoites stain blue with alkaline methylene blue dye.
Live tachyzoites are mixed with different dilutions of the
patient's serum
The mixtures are then incubated for an hour, stained with dye,
and examined with a microscope.
If antibodies toT gondii are present in the patient's serum, they
will damage the organisms.
The damaged organisms will not take up the dye and appear as
pale "ghosts" compared to undamaged organisms.
Test is very sensitive and specific and remains the reference
method.
23. TREATMENT IN MAN:
The treatment of choice is pyrimethamine plus either
trisulfapyrimidines or sulfadiazine.
Folinic acid is given to avoid the hematologic effects of
pyrimethamine-induced folate deficiency.
24. PREVENTION/CONTROL:
Freezing of meat to -20ºC (-4ºF) for 2 days or heating to
60ºC (140ºF) kills cysts.
Children's play areas should be protected from cat and dog
feces.
Daily cleaning of cat litter pans (since oocysts not infective
for 2 to 3 days)
Wear gloves
Wash hands before eating
Should only be fed dry, canned, or cooked meats
Pregnant women shouldn’t handle cats
26. Trypanosoma brucei gambiense and T brucei rhodesiense
T.b.brucei - rarely infects humans-T. brucei are lysed by a factor
in human serum, whereas T. rhodesiense and T. gambiense are
not.
Vector: tsetse fly (Glossina palpalis,G.tachinoides,or G.fuscipes).
27. Trypanosoma brucei gambiense is found in 24 countries in west
and central Africa.
Accounts for more than 98% of reported cases of sleeping
sickness
Causes a chronic infection.
Trypanosoma brucei rhodesiense - 13 countries eastern and
southernAfrica.
2% of reported cases
Causes an acute infection
In 2009, the number of cases reported was 9878
2012 there were 7216 cases recorded. (who,2013)
28. RESERVOIRS
Many wild and domestic animals harbour infection
In Rhodesian trypanosomiasis - domestic cattle and pigs
In Gambian trypanosomiasis, humans are the main reservoir
However the precise epidemiological role of the animal
reservoir in the gambiense form of the disease is not yet well
known.
30. TRANSMISSION:
Transmission is by the tsetse fly bite.
Mother-to-child infection: the trypanosome can cross the
placenta and infect the fetus.
Mechanical transmission through other blood sucking insects
is possible.
Accidental infections have occurred in laboratories due to
pricks from contaminated needles.
33. DISEASE IN HUMANS:
1. The trypanosomal chancre:
Seen at site of the tsetse bite
Appears about 48 hours after and lasts 2-4 weeks.
Local pruritic, painful inflammatory reaction with regional
lymphadenopathy
34. 2. The hemolymphatic stage:
Usually absent or unnoticed in T.b.gambiense infections.
Irregular fevers, headaches, joint pains,
malaise, pruritus, papular skin rash, edemas.
Myocarditis
Trypanosomes enter the lymphatics - lymphadenopathy - T.
gambiense is the enlarged cervical lymph nodes, called
Winterbottom’s sign
36. DIAGNOSIS:
Definitive diagnosis requires identifying the organism in the
bite lesion, blood, lymph node aspirate, or CSF.
Serologic tests become positive after 12 days.
TREATMENT:
Hemolymphatic stage: Suramin, eflornithine or pentamidine.
Late disease: melarsoprol or eflornithine or tryparsamide
plus suramin.
37. PREVENTION/CONTROL:
Wear long sleeves and trousers in endemic areas
Use mosquito nets while sleeping.
Repellents do not work on tsetse flies.
Pentamidine is used as a chemoprophylaxis against the
Gambian type.
38. A new form of human Trypanosomiasis in
India
First human case of T evansi infection in humans was
reproted in the district of Chandrapur in Maharashtra
He had presented episodes of fever associated with
sensory disorders
The patient continued to present peaks of fever at 7–10-
day intervals, with systematically high blood parasite
levels
40. RESERVOIR AND INCIDENCE
Dogs, cats, and guinea pigs are the main reservoirs for human
infection.
T.cruzi occurs only in theAmericas- Southern South America
to northern Mexico,Texas, and the south western U.S.
An estimated 12 million people are infected, mostly in rural
areas, resulting in about 60,000 deaths yearly.
41. TRANSMISSION:
Humans are infected when the insect's feces become rubbed
into the wound caused by the bite of an infected
bloodsucking insect (triatomid) or when the conjunctiva,
mucous membranes or abrasions become contaminated.
Blood transfusions from infected persons
Congenital infection
Breast milk
Laboratory accidents
42. DISEASE IN HUMANS:
Acute illness usually occurs in children
If the primary site of infection is the eye there is unilateral
edema of eyelids and conjunctivitis - Romaña's sign –
PATHEGNOMONIC
Furuncles (chagoma) appear at the point of entry of the
infection.
Signs - fever, malaise, enlarged lymph nodes, liver and
spleen.
Rarely myocarditis and meningoencephalitis
43. The chronic phase
a) Asymptomatic (indeterminate form) - more frequent,
typically in the beginning of the chronic phase and lasting
all life in most of the patients
b) Cardiac form - 30% of the patients, with conduction
disorders, arrhythmia, cardiomyopathy, heart failure and
secondary thromboembolism
c) Digestive lesions -megaoesophagus and megacolon
44. DISEASE IN ANIMALS:
Acute and in apparent infection - wild animals
The acute form- fever, enlarged liver, lymph nodes and heart
irregularities
Lasts 10-30 days – no clinical signs usually - sometimes
myocarditis occurs.
Chronic disease in dogs.
Lesions in dogs resemble those in humans.
45. DIAGNOSIS:
In the acute stage, trypanosomes should be looked for by
examination of anticoagulated fresh blood for motile organisms.
In the chronic stage, the parasite can only be detected by
culture or xenodiagnosis.
TREATMENT:
Therapy is unsatisfactory
PREVENTION/CONTROL:
Destroy the vector by insecticides. Use insect nets to prevent
bites. Screen blood donors
46. LEISHMANIASIS
1. Cutaneous leishmaniasis: most common
Chiclero ulcer, pianbols, uta and buba (in theAmericas)
Oriental sore,Aleppo boil (in the OldWorld)
Baghdad boil, Delhi boil, Bauru ulcer (in the Middle East)
2. Visceral leishmaniasis: kala-azar -most serious
3. Mucocutaneous :espundia
49. 300 000 Estimated cases of visceral leishmaniasis (VL) and
over 20 000 deaths annually
1 million Cases of cutaneous leishmaniasis (CL) reported in
the last 5 years.
310 million People at risk of infection in six countries
reporting over 90%VL cases worldwide
(WHO)
50. RESERVOIRS AND INCIDENCE
Wild animals, dogs and humans serve as reservoirs.
Humans are the only known reservoir in India.
The geographic distribution of the cutaneous disease is Texas,
Mexico, Central and South America, India, Pakistan, the Middle
East, southern Russia, the Mediterranean coast and Africa.
The distribution of visceral leishmaniasis is poorly reported, but
foci probably occur in the Mediterranean basin, the Middle East,
India, China, Mexico, Central and SouthAmerica, andAfrica.
53. DISEASE IN HUMANS:
The primary lesion is a painful ulcer or nodule at the site of infection
with residual scarring skin and mucous membranes.
Infiltration by inflammatory cells at the inoculation site supports the
growth of the parasite.
Large area of chronically inflamed granulation tissue.
The overlying skin undergoes hyperplasia and then necrosis with
spreading ulceration.
The lesions may heal, become fibrosed or extend indefinitely to
produce considerable disfigurement.
57. In the visceral disease
Intermittent irregular fever occurs with sweats, enlarged
spleen, weight loss and anemia leading to ascites, edema,
diarrhea and secondary infections.
Dark pigmentation of the skin may occur.
There is gross enlargement of liver and spleen.
Without treatment, the case fatality rate is 90%.
59. Post kala-azar dermal leishmaniasis
(PKDL)
PKDL is a sequel of visceral leishmaniasis
Appears as macular, papular or nodular rash usually on face,
upper arms, trunks and other parts of the body.
It usually appears 6 months to 1 or more years after kala-azar
has apparently been cured.
People with PKDL are considered to be a potential source of
kala-azar infection
60. DISEASE IN ANIMALS:
L.mexicana causes ulcers of the skin in rodents and other wild
animals- at the base of the tail.
L.braziliensis causes a systemic infection with few skin lesions
in wild animals. No skin lesions have been found in dogs.
Dogs infected by L.tropica may suffer form cutaneous lesions
similar to those found in humans.
L.donovani produces visceral lesions in dogs, with enlarged
lymph nodes, liver and spleen.
61. DIAGNOSIS:
Definitive diagnosis is achieved by finding the parasite-either
the amastigote in stained smears or biopsies, or the motile
promastigote in culture.
Serologic and skin tests provide only indirect evidence of
infection.
TREATMENT:
Treatment remains inadequate because of drug toxicity, long
courses required, and frequent need for hospitalization.The
drug of choice is sodium antimony gluconate.Alternative
drugs for some forms of infection are amphotericin B and
pentamidine.
62. PREVENTION/CONTROL:
Use insecticides in house and buildings to control the vector.
Eliminate rubbish heaps which are breeding areas for
sandflies.
Avoid sandfly bites by protective clothing.
Keep dogs indoors after sundown and remove infected dogs.
64. Epidemiology
Worldwide, the incidence of intestinal sarcocystosis is
estimated to be 6-10%
Approximately 20% of people in Malaysia are sero positive
Throughout Southeast Asia, 21% of autopsy specimens
contain the parasite
More than 60 cases have also been reported in the U.S often
as an incidental finding
67. PREVENTION
Intestinal sarcocystosis
People should avoid eating raw or undercooked beef or pork
Sarcocysts in meat can be destroyed by
Cooking at 700C for 15 minutes
Freezing at –40C for 2 days or freezing at –200C for 1 day
Muscle sarcocystosis
Food contaminated by feces or dirt should be avoided
Good personal hygiene, such as hand washing, may also help to
prevent transmission
68. MALARIA
Plasmodium knowlesy
Anopheles hackeri,Anopheles balabacensis
Parasite naturally occurring among several species of
macaques in SoutheastAsia
Long-tailed macaque (M. fascicularis)
Pig-tailed macaque (M. nemestrina)
Leaf monkeys (e.g.Presbytis melalophos)
Macaca cylopis
The parasite has not been found in M. mulatta (rhesus
monkey) in the wild, probably because P. knowlesi in rhesus
monkey produces a fulminant and almost invariably fatal
infection
69. Asexual replication
• Fertilization and invasion of mosquito gut
• Infected cell releases sporozoites,
which migrate to the salivary glands.
Sexual replication
Exoerythrocytic
cycle
merozoites
released
"ring"
form trophozoite
ruptured
RBC releases
merozoites
schizont
Male and
female
gametocytes
Sporozoites
released from
mosquito salivary
glands invade
hepatocytes
within 30 mins.
Erythrocytic
cycle
69
Cary Engleberg
70. Incubation period -11 to 12 days
Mild to very severe illness
Symptoms include fever, chills, sweats, and headache, and in
some instances, progress to serious illness including
jaundice, blood coagulation defects, shock, kidney or liver
failure, central nervous disorders and coma.
71. BABESIOSIS
Piroplasmosis
Babesia divergens and B.microti.
Ixodes tick
Babesiosis in humans is a rare intraerythrocytic infection
Natural hosts for B. microti are various wild and domestic
animals, particularly the white-footed mouse and white-
tailed deer.
72. TRANSMISSION:
Ixodes tick bites
Transmission from blood transfusion
Splenectomized, elderly, or immunosuppressed persons are
the most likely to have severe manifestations.
73. DISEASE IN ANIMALS:
Many animals show only mild fever and recover
spontaneously.
Hemolysis
Enlarged spleen, liver
Hemoglobinuric nephrosis.
74. DISEASE IN HUMANS:
B. microti infection lasts a few weeks to a month
Irregular fever, chills, headache, diaphoresis, myalgia, and
fatigue but is without malaria-like periodicity of symptoms.
Hemolytic anemia, hepatosplenomegaly.
The disease is self-limited and most patents recover without
sequelae.
Infection with B. divergens has only been reported in
splenectomized patients
Progresses rapidly with high fever, severe hemolytic anemia,
jaundice, hemoglobinuria, and renal failure; death usually
follows.
75. DIAGNOSIS:
ID of the intraerythrocytic parasite on Giemsa-stained blood
smears or serology.
TREATMENT:
B. divergens: blood transfusions, renal dialysis, pentamidine
plus trimethoprim-sulfa.
B. microti:Treat symptomatically since most case are self-
limiting. In splenectomized patients, quinine plus
clindamycin and transfusions.
76. CRYPTOSPORIDIOSIS
Cryptosporidium parvum- people and calves
In recent years, C. ubiquitum, has been emerging as another
major zoonotic species that infects persons
C hominis (formerly C parvum type I) is a specific human
pathogen
77. RESERVOIR AND INCIDENCE
Rodents, birds (particularly turkeys and chickens), ruminants,
fish, reptiles, cats, dogs, rabbits, NHP's.
Children over 2 years of age, animal handlers, travelers, Cattle
farmers,Veterinarians who come in contact with farm animals
Infants and younger children in day-care centers
78. One of the three most common diarrheal-causing pathogens in
the world
10 billion oocysts per gram infected feces
Can be infected by just one oocyst
79. High burden of cryptosporidiosis among children in Indian slum
community (Rajiv Sarkar et al.,2013)
Prevalence in children with diarrhea has been found to range from
1.1% to 18.9% in India
Reported infection in bovines ranged from 11.32% to 69.32% in
India (Chhabra and pathak, 2012)
Cryptosporidium antibodies were detected in the serum of 20 of
23 cats (87%) suggesting that the exposure rate may be high.
80. TRANSMISSION
Transmission is usually fecal-oral
Often through water contaminated by livestock mammal
feces
Person to person transmission through feco-oral route
82. Oocysts passed in stool are fully sporulated and infectious
In humans and animals, the full life cycle occurs within a
single host
Attach to the microvillus borders of enterocytes of the small
bowel and also are found free in mucosal crypts
The host cell membrane deteriorates, leaving the parasitic
membrane in direct contact with epithelial cell cytoplasm
Do not invade the tissues
83.
84. Organisms attached
to an intestinal villus
Intestinal organisms
by scanning EM
39
Source Undetermined Source Undetermined
85. DISEASE IN MAN:
In immunocompetent persons- no symptoms to mild enteritis to
marked watery without mucus or gross or microscopic blood.
Low-grade fever, malaise, nausea, vomiting, abdominal cramps,
anorexia and weight loss
Self-limited and lasts a few days to about 2 weeks.
In immunologically deficient patients, the illness is characterized
by profuse (up to 15L daily), cholera-like diarrhea and by fever,
severe malabsorption, marked weight loss, and
lymphadenopathy.
86. DISEASE IN ANIMALS
Severe watery diarrhoea in neonatal calves and lambs.
In turkeys and chickens, the parasites are reported to occur
in the sinuses, trachea, bronchi, cloaca, and bursa of
Fabricius.
The respiratory disease - coughing, gasping, and air sacculitis.
87. DIAGNOSIS
Diagnosis is by detection of oocysts in stool by a variety of
flotation or concentration methods
By mucosal biopsy, followed by special staining methods that use
modifications of an acid-fast stain
Iodine staining
Acid fast staining
Fluorescein-labeled IgG monoclonal antibody
88. Iodine stain of stool Acid-fast stain of stool
42
Source Undetermined Source Undetermined
90. GIARDIASIS
Most common intestinal protozoan parasite of people in the
U.S.
The parasite occurs worldwide and is nearly universal in
children in developing countries.
Giardia lamblia
91. RESERVOIR AND INCIDENCE:
Humans are the reservoir for Giardia
Dogs and beavers have been implicated as a zoonotic source
of infection
In psittacines, the disease is commonly found in cockatiels
and budgerigars.
Giardiasis is a well-recognized problem in special groups
including travelers, campers, and persons with impaired
immune states.
However, Giardiasis does not appear to be an opportunistic
infection in AIDS.
92. TRANSMISSION
Only the cyst form is infectious by the oral route;
Trophozoites - destroyed by gastric acidity.
Most infections are sporadic
Fecal contamination of water or food
Person-to-person contact
After the cysts are ingested, trophozoites emerge in the
duodenum and jejunum. They can cause epithelial damage,
atrophy of villi, hypertrophic crypts, and extensive cellular
infiltration of the lamina propria by lymphocytes, plasma
cells, and neutrophils.
93. DISEASE IN MAN:
Most infections are asymptomatic.
Acute or chronic diarrhea, mild to severe, with bulky, greasy,
frothy, malodorous stools, free of pus and blood
Upper abdominal discomfort, cramps, distention, excessive
flatus
DISEASE IN ANIMALS:
Dogs and cats - Inapparent or produce weight loss and chronic
diarrhea or steatorrhea, which can be continuous or
intermittent, particularly in puppies and kittens.
Calves - Feces are usually soft, poorly formed, pale, and
contain mucus. Gross intestinal lesions are seldom evident,
although microscopic lesions, consisting of villous atrophy and
cuboidal enterocytes, may be present.
94. DIAGNOSIS:
Diagnosis is by identifying cysts or trophozoites in feces or
duodenal fluid.
Unless they can be examined with an hour, specimens should
be preserved immediately in a fixative.
A stool ELISA test or IgM serology are available.
95. TREATMENT:
Tinidazole, Metronidazole (FLAGYL), quinacrine, or
furazolidone.Alternative drugs areTinidazole or albendazole.
PREVENTION/CONTROL:
Hygiene, protective clothing, when handling animals.
Prevention requires safe water supplies, sanitary disposal of
human feces
Adequate cooking of foods to destroy cysts, protection of foods
from fly contamination, washing hands after defecation and
before preparing or eating foods
Endemic areas - avoidance of foods that cannot be cooked or
peeled.
97. RESERVOIR AND INCIDENCE:
The reservoir of E.histolytica is man.
Most prevalent and severe in tropical areas
It is estimated that there are about 50 million case of invasive
amebiasis and 40,000-100,000 deaths annually worldwide.
In the USA, seropositive rates up to 2-5% have been reported in
some populations.
Reported incidence of 0-31% in the feces of clinically normal
Rhesus monkeys, 2-67% in Chimps, and up to 30% in other
NHP.
98. TRANSMISSION
Transmission may be by ingestion of infective cysts,
contaminated water or food, by flies, or fomites.
Exists as resistant cysts or more fragile trophozoites
Cysts are the infectious form found in the stool of
asymptomatic carriers or patients with mild disease.
The cysts remain viable, if moist and cool for 12 days.
Remain viable for 30 days in water.
Laboratory animal personnel are usually infected from fecal
matter transferred to the skin or clothing.
99. DISEASE IN HUMANS
Mild to moderate colitis: recurrent diarrhoea and abdominal
cramps, sometimes alternating with constipation; mucus may
be present; blood is usually absent.
Severe colitis: semi formed to liquid stools streaked with blood
and mucus, fever, colic, prostration.
In fulminant cases, ileus, perforation, peritonitis, and
haemorrhage occur.
Hepatic amebiasis: fever, hepatomegaly, pain, localized
tenderness.
100. DISEASE IN ANIMALS:
In dogs, infection by E. histolytica is generally asymptomatic
and frequently localized in the cecum.
Rhesus monkeys are generally resistant and usually
experience asymptomatic infection, but chronic, mild colitis
can occur.
In chimpanzees, the infection can persist for a long time, in
most cases subclinically, but sometimes it invades the tissues
causing ulcerative colitis and hepatic abscesses.
102. DIAGNOSIS:
Cysts or trophozoites in feacal sample
Indirect HI for hepatic amebiasis
Ultrasonography can locate the cyst and fine needle
aspiration is performed to find the organism.
104. TREATMENT:
May require the concurrent or sequential use of several drugs.
PREVENTION/CONTROL:
Strict sanitation and personal hygiene, protective clothing and
gloves.
Fecal screening of NHP.
Protect water supply from fecal contamination.
Usual chlorine levels don't destroy cysts. 10ppm chlorine
residual necessary to destroy cysts
Heat to 50ºC (122ºF) kills cysts.
Adequate cooking to destroy cysts.
Protect food from fly contamination.
106. RESERVOIR AND INCIDENCE
Distributed worldwide especially in the tropics
Reservoir hosts – Swine, rats and NHP's.
Humans, great apes, and several monkey species
Incidence in NHP colonies - 0 to 63%
Usually asymptomatic, but may see diarrhoea.
107. TRANSMISSION:
Ingestion of cysts or trophozoites from infected animal or
human feces.
Cyst is the infectious form.
Contaminated water or food.
108. DISEASE IN ANIMALS AND MAN
Many infections are asymptomatic and probably need not be
treated.
Chronic
Recurrent diarrhea, alternating with constipation
Severe dysentery with bloody mucoid stools, tenesmus (the
constant feeling of the need to empty the bowel,
accompanied by pain, cramping, and involuntary straining
efforts), and colic may occur intermittently.
109. DIAGNOSIS:
Use fresh fecal samples to identify trophozoites or cysts.
Trophozoites in scrapings or biopsy of ulcers of the large
bowel.
TREATMENT:
Tetracycline or Iodoquinol
PREVENTION/CONTROL:
Good sanitation & personal hygiene practices in NHP and
swine colonies.
Protect water and food from fecal contamination.
Identify positive lab animals and treat.
110. REFERENCE
Dhumne M., Sengupta C., Kadival G., Rathinaswamy ,A.
AndVelumani A. (2007). – National seroprevalence of
Toxoplasma gondii in India. J.Parasitol., 93: 1520-1521.
WHO ,Weekly epidemiological record, no. 7, 18 february
2005
www.who.int