The vaccine, called the HIV-1 DNA, immunised mice and monkeys from sub-type C — the type of HIV, which accounts for more than 95 per cent of infections in India — in trials carried out since 1996. A vaccine is the surest shield against HIV/AIDS. Finally it is ready for use and recognition! In December last year, Dr Pradeep Seth gave himself what could turn out to be the most important injection of his life. He had earlier tried out the injection — a vaccine for HIV — on mice and monkeys. The vaccine had worked on the animals. And...