News that a gay meth user in New York who had hundreds of unsafe sexual encounters may carry a virulent, drug-resistant strain of HIV has forced health officials and gay community leaders to take a sobering look at the growing role crystal methamphetamine is playing in the spread of AIDS. Doctors are unsure whether the new strain is an isolated case or the precursor of a deadly new wave of HIV. But it's clear that a dangerous nexus has formed between the nation's two big epidemics: AIDS and methamphetamine abuse.