31.   The virus frequently infects certain monkey and small rodent species, and it has been known for years to sometimes spread to humans.

32.   The virus infected frozen pilchards which were used to feed the blue-fin tuna farms of the area.

33.   The virus also infects every executable file that is launched.

34.   The virus infects and multiplies in cancer cells but does not attack normal cells.

35.   The virus infects birds that roost near freshwater swamps, where the swamp mosquito Culiseta melanura dwells.

36.   The virus has infected one in four adults in Botswana and Zimbabwe, and almost one in five adults in several other African countries.

37.   They often have other sexually transmitted diseases, which is thought to make it easier for the AIDS virus to infect them.

38.   This will ensure that no virus can infect it.

39.   Unlike bacteria, which are content simply to suck up nutrients from a culture dish, viruses must infect a cell before they can reproduce.

40.   Was a similar virus infecting people?