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HLTB21H3 (204)
Lecture 11

lecture 11

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University of Toronto Scarborough
Health Studies
Caroline Barakat

L1 1 - Hum an Imm uno deficiency Virus attacks the imm une system resulting in chronic, progressive illness - leaves people vulnerab le to opport unistic infections and cancers - results in AIDS (Acqu ired Imm unodeficiency Syndrome) whe n the body can no longer fight infections - on averag e - it takes more than 10 years for the disease to prog ress HIV AIDS Et iology - retrov irus - contains an enzyme reverse transcriptase - replicates to prod uce viral DNA from its RNA genom e - HIV-1, found throughout the world - 1981 in United States -- - HIV-2, primarily found in West Africa - where virus may have been in circulation since the 1960s and 1970s - both types have several subtypes Modes of Tra ns m issi on - mu st enter the bloodstream - unprotected sex - occupational exposure in health care settings - the sharing of needles or equipment for injecting drugs, tattooing, skin piercing or acupuncture - pregnancy, delivery and breastfeeding (from an HIV-infected mo ther to her infant) - mainly depends on behavioural, occu pational settings - refe
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