Microbiology and Immunology 2500A/B Lecture Notes - Blood Culture, Balamuthia Mandrillaris, Cutaneous Leishmaniasis
16 Oct 2012
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Document Summary
Ectoparasites lice, fleas, flies that bite, poisonous spiders. There are three types of symbiotic relationships commensalism, mutualism, and parasitism. Often associated with travel, both domestic (e. g. camping) and foreign. Symptoms may not develop until late in a trip or following return. Symptoms may be prolonged and/or recurrent: depending on parasite, can be mild or severe. Presence of any protozoa (even nonpathogenic varieties) in stool indicates exposure to contaminated food or water. Cysts are the infective form, trophozoites are the active form. Diagnosis of parasitic infections depends on lab tests. Examination of permanent stained smear is best. Three negative stools to rule out pathogens. Five negative stools to rule out giardia. Worldwide problem via contaminated surface water (beaver fever most common in waters where canadian beavers live) Soft, foul stools with flatus, bloating, gurgling, weight loss, fatigue. Trophozoite is much bigger than the cyst.
