BIOL 303 Chapter Notes - Chapter 1: T Helper Cell, Aids, Memory T Cell
26 Apr 2013
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Chapter 1: a case for evolutionary thinking: understanding hiv. Hiv (human immunodeficiency virus) causes aids (acquired immune deficiency syndrome) W. h. o global death from major diseases. Epidemics: influenza (1918), black death (1347-1452), smallpox (1520) & aids (1981: heart attack (12. 6%), cancer (12. 5%), stroke (9. 7%), lower rti (6. 8%), aids (4. 9%), tuberculosis (2. 7%) & malaria (2. 2%), etc. Hiv infectious rates across the globe: north america & western europe much lower than sub-saharan africa. Hiv prevention: 1st condom usage decreased the rate of transfer, but due to the effectiveness of long-term drug therapies, the percentage of risky sexual behavior increased, hence the rate of infection hiv increased again since 2000. Intracellular parasite that invades specific host cells & uses its enzymatic machinery (dna polymerase, Ribosomes & trna) & energy for replication, killing the host cell in the process: extracellular/infectious phase: virion moves from host cell to another & transmission is possible.
