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Table 2 Purposefully anthrax spore-contaminated soil samples examined by the classic method at three dilution levels and by the GABRI method

From: Ground Anthrax Bacillus Refined Isolation (GABRI) method for analyzing environmental samples with low levels of Bacillus anthracis contamination

Soil sample Anthrax spores added to sample CFU of B. anthracis isolated by classic method CFU of contaminants isolated by classic method CFU of B. anthracis and contaminants isolated by GABRI method
Total of 10 plates Total of 10 plates Total of 10 plates
Undiluted 1:10 1:100 Undiluted 1:10 1:100 CFU of B. anthracis CFU of contaminants
N.1 520 0 0 0 725 341 124 2 8
N.2 480 0 0 0 714 337 8 2 9
N.3 500 0 0 0 1000 289 54 2 3
N.4 570 0 0 0 225 45 1 6 4
N.5 430 0 0 0 334 29 1 4 15
N.6 500 0 0 0 584 292 2 3 27
Average 500 0 0 0 597 222.2 31.6 3.2 11.0