Progress in AIDS Vaccine

A large scale study in Thailand finds some success with an H.I.V. vaccine:

Col. Jerome H. Kim, a physician who is manager of the army’s H.I.V. vaccine program, said half the 16,402 volunteers were given six doses of two vaccines in 2006 and half were given placebos. They then got regular tests for the AIDS virus for three years. Of those who got placebos, 74 became infected, while only 51 of those who got the vaccines did.

Although the difference was small, Dr. Kim said it was statistically significant and meant the vaccine was 31.2 percent effective.

Not bad, you gotta start somewhere.