41.   Genes that in most people slow the progression of an AIDS virus infection have some variations that actually accelerate the disease, U.S. researchers reported Friday.

42.   His early summer performances were affected by a virus infection and an allergic reaction to medicine.

43.   Interferon provides the first line of defence against virus infections.

44.   International health experts are checking five possible new cases of Ebola virus infection in Zaire, two of them in Kinshasa, the World Health Organization said Thursday.

45.   International health experts Thursday were checking five possible new cases of Ebola virus infection in Zaire, a World Health Organization official said.

46.   International health experts were checking five possible new cases of Ebola virus infection in Zaire on Thursday, a World Health Organization official said.

47.   Most West Nile virus infections cause few or no symptoms.

48.   Researchers will wear protective suits, use outside air supplies and take an experimental drug that has proved successful in tests against virus infections.

49.   Scientists from the U.S. Centers for Disease Control and Prevention arrived Saturday to help Philippine authorities investigate Ebola virus infection among local monkeys.

50.   Researchers will wear protective suits, have outside air supplies and will even take an experimental drug that has proved successful in tests against virus infections.