TIME EVOLUTION OF THE FRACTION OF NEW HIV INFECTIONS DUE TO PRIMARY INFECTION AMONG HIGH RISK GROUPS IN SOUTHERN INDIA - Pickles, M; Boily, MC; Vickerman, P; Ramesh, BM; Washington, R; Deering, K; Verma, S; Blanchard, J; Moses, S; Alary, M (SEXUALLY TRANSMITTED INFECTIONS, 2011)