21.   Most state labs and hospitals, in suspected human cases, begin with nasal swabs.

22.   Nasal swabs can tell whether large particles of anthrax have been caught in nose hairs, a confirmation of exposure.

23.   Nasal swabs taken of Arizmendi showed no trace of anthrax.

24.   Nasal swabs were taken from thousands of other staffers, police, visitors and reporters who went to the Hart building Monday.

25.   Nasal swabs on Butt and on his cellmate tested negative.

26.   Officials noted repeatedly that only the letter had so far tested positive for anthrax and that it was too early to have results from nasal swab testing.

27.   Quickly, doctors ordered that a nasal swab be taken from Blanco.

28.   Results from blood tests and some nasal swabs are still out.

29.   Results from the nasal swabs should be available Monday, an official at the testing clinic said.

30.   Still another test involves taking nasal swabs from people who may have been exposed.