An Indian sex worker has her mouth examined by a doctor at a health clinic in a red-light district in Calcutta July 7, 2004. India has 5.1-million HIV-infected people, the second-largest number in the world after South Africa, and one key element of the country's national programme to control the spread of the disease is to get hundreds of thousands of sex workers to insist on clients using condoms. Picture taken on July 7, 2004. REUTERS/Jayanta Shaw SD/TW