a. Can you think of a plausible series of events that could explain how HIV came to be so widespread?
b. Explain why there can be such a discrepancy between the total number of reported cases of AIDS and the projected number of cases estimated by health authorities.
c. Using figure 25.15 and table 12.6 as references, outline the strategies of anti-HIV drugs and their effects as correlated with the virus cycle.
Figure 25.15

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Period of infectiousness (virus present) Antibody () Antibody (+) 2 2 weeks Exposure IV Months-years 1 month 2-15 years Incubation period Symptoms occur (T) Infection with virus. (II) Appearance of antibodies in standard HIV tests. (III) Asymptomatic HIV disease, which can encompass an extensive time period. (IV) Overt symptoms of AIDS include some combination of opportunistic infections, cancers, and general loss of immune function