HSS 1100 Lecture Notes - Lecture 7: Giardia Lamblia, Bright-Field Microscopy, Intestinal Parasite Infection
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Parasitism can be short term (mosquito) or permanent (tapeworm) (most successful) can release huge # of offspring. Ability of finding diff ways of getting to hosts (routes of transmission) First true living cell that"s been observed and documented scientifically (1681) Acute giardiasis = short term diarrhea, weight loss, nausea, vomiting, in children it can cause failure to thrive (slow growth) From poorly treated/ untreated water supply and poor hygiene (mostly occurs in young children) Uv light, epa method 1623: multiplies, found in small intestine (is shed in faeces and returns to cyst) Look for cysts in stool with use of bright-field microscopy. Immunofluorescent microscopy using fluorochrome-conjugated antibodies that bind to cyst wall. Commercially, diagnosed through immunological testing (detection of giardia- specific antigens in faeces) Treatment through antiparasitic drugs (for long term chronic infection) Parasites can become drug resistant like bacteria. No resistant cyst stage (trophozoites can carry)