Problem
1. Why are other cells not targeted by the virus?
2. How should cytotoxic T cells respond to the initial phase of HIV infection (when some T helper cells are still functioning)? Explain your reasoning.
3. As time progresses, why do the cytotoxic T cells stop responding to the HIV infection? Propose an explanation.
4. What happens to the immune system after HIV infection? Why? Can this account for the symptoms of AIDS (i.e., immunodefi ciency, or the inability to defend against any foreign invaders like viruses and bacteria)?
5. Why do you suppose that there is a delay between the time of HIV infection and the appearance of symptoms (and AIDS)?
6. How does HIV evade the immune system?