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)