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University of Toronto Scarborough
Health Studies
Caroline Barakat

HLTA01 Notes I Chapter 1: The Nature of Plagues Legionaries Disease 1976 - Turner - in the lobby of the Bellevue-Stratford Hotel - bacteria: Legionella in aerosolized water - symptoms: high fever, chills, headache, muscle aches, dry cough, chest pains, shortness of breath, vomiting, and diarrhea - death: lungs filled with fluid and pus, confusion, disorientation, hallucinations and loss of memory Toxic Shock Syndrome 1979 Mary Benton - isolated to females, tampons cross linked with carboxymethyl cellulose w polyester foam - bacteria: Staphylococcus aureas - symptoms: nausea, chills, diarrhea, headache, sore throat, brownish discharge pelvic - death: multi-organ failure, low blood pressure, hepatitis, renal insufficiency, internal blood clots SARS (severe acute respiratory syndrome) 2003 Chinese Physician - in Hong Kong, virus - symptoms: fever, dry cough, sore throat, headache - death: respiratory failure Transmission the movement of parasite from host to host (direct or indirect - vectors) Vector animate intermediaries ex: flies, mosquitoes, fleas, ticks etc. - Transmission by vector mechanical(the bite wound of a mosquitoes) or developmental (parasites that grow in snails or mosquitoes) Parasite obtain resources needed for their growth and reproduction, parasite may harm host, but may not outright kill them [ex: malaria parasite, red blood cell killer, white blood cell killer (HIV)] Micro parasite: 1600 microscope Prokaryotes 1-5 um in size, free living or parasitic o Bacteria spherical (coccus), rod shaped (bacillus), corkscrew (spirillum or spirochete) Protozoa 5-15 um in size, one-celled eukaryotes, can lead an independent existence (in water) or be parasitic Virus smaller than bacteria, must be in living cell to reproduce, neither cell nor organism Macro Parasite: do not require microscope to see - composed of many cells [ex: flatworm, roundworm, tapeworm, mosquitoes, flies, lice] - usually do not multiple within an infected host (except in larvae stages in an intermediate hosts) instead, produce infective stages that usually pass out of the body of one host before transmission to another
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