NEW YORK — The results of a new HIV vaccine trial in Thailand, although encouraging since they show a lowered rate of infection among those vaccinated, should be treated with cautious optimism.

The hope of a breakthrough is, nonetheless, excellent news, considering that every day 7,000 people worldwide are newly infected with HIV and that in 2007 over 2 million people died of AIDS according to UNAIDS (Joint United Nations Program on HIV/AIDS).

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