HSS 1100 Study Guide - Final Guide: Microbial Cyst, Lymphadenopathy, Diphyllobothrium

• School: University of Ottawa
• Department: Health Sciences
• Course: HSS 1100
• Professor: William Yan

Document Summary

Intimate and obligatory symbiotic relationship btwn two organisms of different species. Parasite is metabolically and physiologically dependent on host. Success of parasites determined by: prevalence in hosts, # of host species available, geographic range, # of offspring, available routes of transmission. Giardia lamblia: giardiasis infection of small bowel, asymptomatic, diagnosis by identification of cysts in feces by microscopy (stool exam, retardation of growth and development in young children, most common protozoan infection of intestinal tract. Public health education and sanitary disposal of feces. 40-50% asymptomatic: associated with itching, foul smelling, sometimes frothy discharge, may increase susceptibility to cervical cancer/hiv infection, diagnosis: wet mounts to identify trichomonads in vaginal or urethral discharge vary greatly in size. Toxoplasma gondii: recognized as a human pathogen in early 1900s, very high seroprevalence in humans worldwide, cats are the only definitive hosts (shed oocysts, congenital infection may be very serious. Ingestion of tissue cysts: congenital infection of fetus.