TABLE 3.
Log2 differences in the comparison of test results from incubation occurring aerobically and anaerobically
| Supplement and antibiotic | na | No. of strains with log2 differenceb
|
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| −7 | −6 | −4 | −3 | −2 | −1 | 0 | 1 | 2 | 3 | 6 | 8 | ||
| Blood | |||||||||||||
| Bambermycin | 26 | 7 | 17 | 2 | |||||||||
| Virginiamycin | 26 | 3 | 17 | 6 | |||||||||
| Avilamycin | 26 | 5 | 3 | 15 | 3 | ||||||||
| Narasin | 26 | 1 | 16 | 6 | 3 | ||||||||
| Avoparcin | 26 | 1 | 8 | 14 | 3 | ||||||||
| Bacitracin | 26 | 3 | 21 | 1 | 1 | ||||||||
| Tylosin | 26 | 1 | 13 | 9 | 2 | 1 | |||||||
| None | |||||||||||||
| Bambermycin | 25 | 1 | 1 | 1 | 4 | 14 | 2 | 1 | 1 | ||||
| Virginiamycin | 25 | 3 | 19 | 1 | 1 | 1 | |||||||
| Avilamycin | 25 | 3 | 13 | 8 | 1 | ||||||||
| Narasin | 25 | 1 | 1 | 5 | 14 | 4 | |||||||
| Avoparcin | 25 | 1 | 12 | 12 | |||||||||
| Bacitracin | 25 | 1 | 7 | 11 | 6 | ||||||||
| Tylosin | 25 | 1 | 14 | 6 | 2 | 2 | |||||||
a
Number of strains tested.
b
A positive difference is a higher MIC of the antibiotic incubated anaerobically; a negative difference is a higher MIC of the antibiotic incubated aerobically. Strains were tested for log2 differences of between −7 and 11; however, no differences of −5, 4, 5, 7, or 9 to 11 were found.