TABLE 3.
Monthly variation in the frequency of antibiotic resistance phenotypes in E. colia
| Resistance pattern | % of population (fresh feces/stored manure) with pattern in:
|
|||||
|---|---|---|---|---|---|---|
| March | April | May | June | July | August | |
| Am | 0.0/14.0 | 0.0/0.0 | 0.0/1.9 | 0.0/0.0 | 0.0/0.0 | 0.3/0.0 |
| Te | 0.0/2.6 | 0.0/4.8 | 0.0/3.2 | 6.9/7.6 | 18.8/0.0 | 6.4/19.4 |
| AmTe | 0.3/13.1 | 2.1/7.7 | 0.5/10.9 | 4.0/1.7 | 14.1/3.2 | 15.7/7.4 |
| TeSu | 18.7/1.6 | 0.3/1.1 | 0.0/0.4 | 19.0/1.7 | 8.8/0.8 | 1.6/6.9 |
| AmSmTe | 0.0/1.4 | 1.6/9.7 | 0.0/5.9 | 0.3/1.2 | 3.5/0.0 | 11.2/1.1 |
| AmSuTe | 9.8/6.3 | 1.8/2.3 | 1.0/3.4 | 12.4/7.0 | 7.0/2.4 | 2.9/7.1 |
| AmTeTm | 0.3/7.8 | 1.8/2.8 | 0.0/4.4 | 4.0/1.7 | 8.2/5.6 | 5.1/7.7 |
| SmTeTm | 0.0/0.2 | 0.0/0.3 | 0.0/0.2 | 22.2/0.0 | 0.6/0.0 | 0.0/1.1 |
| AmSmSuTe | 0.5/2.3 | 6.0/2.6 | 2.1/3.2 | 1.6/4.1 | 3.5/0.8 | 3.5/4.3 |
| AmClSmSuTe | 1.3/1.2 | 32.9/0.6 | 28.7/1.7 | 0.5/5.2 | 4.4/8.1 | 5.1/1.1 |
| AmCtSuTeTm | 5.3/9.3 | 0.0/4.5 | 0.0/9.5 | 0.5/2.9 | 1.2/0.8 | 0.0/2.3 |
| AmClSmSuTeTm | 0.5/0.3 | 10.4/0.3 | 11.0/0.4 | 1.3/2.3 | 0.9/10.5 | 0.0/0.3 |
| AmCtSmSuTeTm | 5.8/1.7 | 0.0/5.4 | 0.0/18.5 | 0.0/2.3 | 2.9/0.0 | 0.3/2.0 |
| AmClCtSmSuTeTm | 15.4/0.2 | 3.1/1.1 | 2.1/2.1 | 0.3/8.1 | 0.6/0.8 | 0.0/0.3 |
| Othersb | 42.2/38.1 | 39.9/56.8 | 54.6/34.5 | 27.0/54.1 | 25.5/66.9 | 47.8/38.9 |
a
Sample sizes are identical to those used for Table 2.
b
Aggregate of all isolates with phenotypes that were each detected in less than 2% of the total collection.