Epidemiology of infectious diseases

In the early 1980’s, epidemiologists recognized that AIDS occurred most frequently among men who had sex with men and in intravenous drug users.
How this information might be used for each of the following:
1) Population or community health assessment
2) Search for causes
3) Individual decisions

Note: Should use authorized sites or resources, scentific or academic resourses as World Organization Health (WHO) site and so on.
Use sub-heading for each part
– Also if you can add valued figures (e.g. chart or graph ) explain the idea that will be perfect.
– The references which you will use, I need their direct links to be mentioned end of the answer (just copy these links and paste it for me ) .

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