when hiv is transmitted sexually, the virus must cross a tissue barrier to enter the body. how that happens is still unclear. the virus might invade directly or be carried by a series of different kinds of cells.
eventually hiv travels through lymph vessels to lymph nodes and the rest of the lymph system. but what is not known is how the virus proceeds to destroy the body’s cd-4cells that are needed to combat invading infectious agents.
how does hiv subvert the immune sys-tem？
although hiv kills the immune cells sent to kill the virus, there is widespread variation in the rate at which hiv infected people become ill with aids. so scientists ask：can the elements of the immune system responsible for that variability be identified？if so, can they be used to stop progression to aids in infected individuals and possibly prevent infection in the first place？
what is the most effective anti-hiv therapy？
in th