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