The quest for a cream or gel to prevent Aids infection has narrowed to using powerful HIV pills that are already on the market, scientists say.
New research has concluded that the vaginal microbicide gel, PRO 2000, does not prevent HIV infection in women, a study released on Monday said.
A microbicide study involving 11 000 women from six African countries will present its results in November.
Microbicides and vaccines offer the best hope for a cure for HIV.
The first microbicide to reach the final phase of testing has failed to prevent HIV transmission, researchers announced this week.