31.   The other half will receive a vaccine into which some genes responsible for producing important HIV proteins, some building blocks of the virus, have been inserted.

32.   The study continues today, he said, even though all Gambian children receive the vaccine.

33.   They included volunteers who had previously received smallpox vaccine and those who had not, in part to determine how many injections might be needed.

34.   Those allergic to eggs cannot receive the vaccine, since it is made with eggs.

35.   Two-thirds of the participants will receive the vaccine, while one-third will receive a placebo, a neutral substitute.

36.   When adults who have received the vaccine develop shingles, they appear to have notably mild cases, without protracted pain.

37.   Without intervention, Gates said, it might be years before children in poor countries receive these vaccines.

38.   Patients receiving the vaccine develop a mild form of polio that results in immunity.

39.   All children under five will receive oral vaccines in two stages one month apart.

40.   As a result, infants were infected with the disease while receiving vaccines from dirty needles.