1.   One way of telling whether a horse has completely eliminated the infection is to take follow-up nasal swabs.

2.   All were tested using nasal swabs and treated with Cipro, an antibiotic known to be effective against anthrax.

3.   Another mailroom worker tested positive in a nasal swab for anthrax exposure but did not become ill and is being treated with antibiotics.

4.   Archer, however, said Thursday that the results of nasal swabs should not be used to determine individual treatment decisions.

5.   A negative result on a nasal swab tells even less.

6.   A positive nasal swab result definitely indicates anthrax exposure.

7.   A similar number opted to have nasal swabs to test for exposure to the disease.

8.   But CDC officials warn that for all their epidemiological value, nasal swabs have little or no value in diagnosing anthrax in patients.

9.   But one editor at the company and several other employees said all five had tested negative with the nasal swabs.

10.   Dailey said she thought that a single anthrax spore had been detected in the nasal swab testing, though she was not precisely certain.