BIOLOGY 154 Lecture Notes - Lecture 1: Drug Injection, Condom, Shingles

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Infections that occur more frequently and are more severe in individuals with weakened immune systems. Many pathogens only make you ill when you are stressed, tired, malnourished, fighting other diseases. Prevalence: percentage of population with the disease. How many people have it at a given time. Incidence: the number of people newly infected. Incidence is going up and then as people become more educated about it and start treating people, it goes down. Reasons for differences among populations: geography a. less aids related deaths but higher infection rates in developed countries, more aids related deaths but, culture, cultural norms, contraception seen as taboo, male dominated societies, gender. All symptoms pointed to absence of functional immune system. Usually only seen in people with compromised immune systems. Low t helper cell count (< 200/ml) Now considered to have aids even if no other symptoms. Hiv + means virus is in body.

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