After a Mississippi doctor revealed last year that she accidentally cured a baby born with HIV, skeptics suggested the tests that initially showed she was infected may have been wrong. However, on Wednesday doctors at an AIDS conference in Boston revealed that the virus has been cleared from a second baby born 9 months ago in Long Beach, Calif. In the U.S. transmission from mother to child can usually be prevented via prenatal drugs, but the mother, who is mentally ill and has advanced AIDS, didn't take the medication she was prescribed. After hearing about the Mississippi baby, the girl's...