41.   Law enforcement officials said on Wednesday that laboratory tests of airplane parts have not confirmed the presence of explosive material, even though some preliminary tests had showed traces.

42.   Meanwhile, the U.S. State Department announced that preliminary tests on two mailbags sent to the U.S. Embassy in Lithuania found traces of anthrax.

43.   Meanwhile, Virginia Gov. Jim Gilmore said today that preliminary tests on a man admitted to a Prince William County hospital are all negative for anthrax.

44.   Nguyen worked in the stockroom of the Manhattan Eye, Ear and Throat Hospital, but preliminary tests there turned up no evidence of anthrax.

45.   Once again, preliminary tests indicated that the animals were sick from something else.

46.   On Friday, the State Department of Health said preliminary tests of three additional crows found in northern Florida showed evidence of West Nile virus.

47.   On Wednesday, preliminary tests indicated that the pigs did not have foot-and-mouth, though conclusive results will not be ready for days.

48.   Police are investigating the incident and the substance in the envelope is being tested, but preliminary tests of the air in the newsroom found no evidence of contamination.

49.   Preliminary tests by the police indicated that they had contained chemicals, television said, but there was no word on what these were.

50.   Preliminary tests came back negative.