51.   The company would not discuss the details of the laboratory trials, but did say it began testing the vaccine in healthy, uninfected volunteers last week.

52.   The company said it wants to test the vaccine at a laboratory in Belgium owned by a U.S. subsidiary, making U.S. approval necessary.

53.   The genetically engineered vaccine was tested first in kidney dialysis patients, and it cut their risk of staph blood poisoning in half for nearly a year.

54.   The U.S. government asked Russia for a sample so it could test vaccines, but no samples were provided.

55.   The Thai government began Tuesday testing a vaccine that it hopes will yield protection against the virus that causes AIDS.

56.   The virus used to test the vaccine was also a laboratory-made combination of the two viruses.

57.   This then spread when the vaccine was tested in the Belgian Congo.

58.   The vaccine was tested in patients with non-Hodgkins or B-cell lymphoma, or cancer of the cells that produce disease-fighting antibodies.