Research shows an evolution of HIV in the body. "We're getting a very good feel that the virus that ___________________________a bit from the virus that ultimately evolves after months and years of replication."

Dr. Fauci describes the virus initially transmitted as being "very restricted in its diversity, which interestingly, ___________________________than we would have thought. Now having said that, we haven't been successful in blocking anything right now, but the nature of the virus is something that is very important." Fauci will discuss the "brief window of opportunity and vulnerability" at this month's 18th International AIDS Conference in Vienna.

"Once the virus establishes itself and truly begins to replicate, it establishes what we call a reservoir that is almost impossible, with the tools that we have now, to eradicate."

Studying those early infections, Fauci says, could lead to insights for a better prevention and treatment of HIV/AIDS and the development of a vaccine. He says test results of a new microbicide will be released at the AIDS conference. ___________________________, but this candidate releases antiretroviral drugs.

(1)transmits to an individual is different
(2)may make it even easier to block
(3)Past microbicides have failed to block HIV