11.   It is made from a weakened live virus.

12.   Paul questioned whether one exposure to the weakened virus will be enough to produce long-lasting immunity against AIDS.

13.   Researchers earlier reported that the weakened virus can cause AIDS in infant monkeys.

14.   Using a weakened AIDS virus as a vaccine might actually cause the disease, a study in monkeys suggests.

15.   Weakened AIDS virus may be hazardous as vaccine, monkey study suggests.

16.   The vaccines, given orally and for free over several doses, contain weakened virus to stimulate the production of human antibodies against the disease.