1.   And once spores are detected in an area, additional swabbing cannot tell whether newly found spores came from an old dispersal or a new one.

2.   A second need is to determine the most effective environmental sampling techniques before and after cleanup measures are started to detect spores that could germinate.

3.   But no anthrax spores were detected at her post office or near her mail slot.

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

5.   Furthermore, the swabs may simply fail to detect spores.

6.   Infection can occur even if no spores are detected in noses.

7.   Moreover, scientists suspect that a swab would not detect spores in someone exposed to them a few days earlier.

8.   Plant pathologist David Rizzo of the University of California at Davis took a sample, and laboratory tests performed by Garbelotto detected spores from the deadly pathogen.

9.   Spores also were detected in samples from work surfaces in the mailroom at American Media, the CDC said.

10.   They said they felt angry that the U.S. Postal Service had apparently failed to clear their workplace of anthrax since the spores were first detected there in late October.