HSS 1100 Study Guide - Giardia Lamblia, Protozoan Infection, Intestinal Parasite Infection
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HSS 1100 Full Course Notes
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Document Summary
Intimate and obligatory symbiotic relationship between two organisms of different species. Parasite is metabolically and physiologically dependant on host. Very common way of life (50% of animal species) True parasites include protozoans (simplest, single-celled), helminths (worms), and arthropods (ectoparasites) Success of parasites defined in terms of: Number of offspring (they make a lot of offspring so their species can survive) Available routes of transmission (more routes of transmission = spreads faster) Demonstrated to be a true pathogen in the early 1900"s. Acute giardiasis: diarrhea, weight loss, abdominal discomfort, nausea, vomiting. Retardation of growth and development in young children (failure to thrive) Most common protozoan infection of intestinal tract worldwide. Prevalence rises through infancy and childhood and declines in adolescence (related to faecal-oral route of transmission) Other high risk groups include travelers and immunocomprimised. Trophozoites in small intestine (free living, multiplying form; endogenous=inside host)