By Tina Rosenberg
Not since the announcement in 1996 that antiretroviral therapy could effectively control H.I.V. has there been a season of AIDS news as hopeful as this one. Trials of a new microbicide have brought positive results; ongoing studies of circumcision are showing that it gives strong, lasting, protection; a man has been cured of H.I.V. infection and new animal and clinical trials are raising hopes that he won’t be alone.