Volume 8, Number 10—October 2002
Surface Sampling Methods for Bacillus anthracis Spore Contamination
|Method||No. samples tested||B. anthracis detected (%)||Rangeb (CFU/cm2)||Medianb (CFU/cm2)||Levela
|Dry swab||28||4 (14)||0.45–232.5||60.9||24||1||1||2|
|Wet swab||67||36 (54)||0.78–232.5||15.5||31||4||14||18|
aLevel of B. anthracis (CFU/cm2): negative = 0, low = 0.1–1.6, medium=1.7–15.5, and high=>15.5.
bPositive samples only.
c232.5 CFU/cm2 is the maximum value considered too numerous to count for a concentration; 300 CFU is the maximum value considered too numerous to count for a culture.
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