Human disease caused by parasites

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Presentation transcript:

Human disease caused by parasites Predominant intestinal parasites Intestinal entry and maturation Intestinal entry, disease elsewhere Larval stage leaves the gut Skin entry, gut manifestations Mature stage enters the gut Skin entry, disease elsewhere Dissemination Failure to complete life cycle

Predominant intestinal parasites Intestinal worms: ascaris lumbricoides trichuris trichiuria taenia saginata enterobius vermicularis Intestinal protozoans giardia lamblia cryptosporidium parvum entamoeba histolytica

Human disease caused by parasites Intestinal entry, disease elsewhere acquired toxoplasmosis hydatid disease (echinococcus) cysticercosis (taenia solium) visceral larva migrans (Toxocara canis) trichinosis (trichinella spiralis) Skin entry, intestinal manifestations Hookworm Strongyloides Schistosoma mansoni

Human disease caused by parasites Skin entry, localized disease Leishmaniasis Filariasis Skin entry, disease by dissemination Malaria Trypanosomiasis Schistosomiasis

Intestinal Parasites : mode of infection Ingestion of cysts, oocysts or ova Entry of larvae or oncospheres Site of adult stage or disease Cryptosporidium Giardia Amoebiasis Intestine Toxoplasmosis Visceral larva migrans Trichinella Ingested Disseminated Ascaris Trichuris Enterobius Hookworm Strongyloides through skin

Symptoms Parasite Abdominal pain and distension Giardia Cryptosporidium Amoebiasis Ascaris, hookworm, taenia Diarrhoea +/- malabsorption Strongyloides Diarrhoea with blood loss Trichuris Hookworm Tenesmus, prolapsed rectum

Intestinal parasites: Symptoms

Intestinal Parasites : Symptoms

Intestinal Parasites : Surgical Symptoms