Table 3.
Salmonella Serotypes and Observed Antimicrobial Susceptibility Phenotypes Recovered from Subiliac Lymph Nodes of Feedlot Cattle and Cull Cows
| Animal type | Serotype | Antimicrobial resistance phenotypea | Number of lymph nodes |
|---|---|---|---|
| Cull | Mbandaka | S | 1 |
| Kentucky | S | 1 | |
| Dublin | Ap, C, K, G, Su | 1 | |
| Dublin | Ap, C, K, G, Su, Te | 1 | |
| Newport | Am, Ap, F, T, C, S, Su, Te | 1 | |
| Reading | Am, Ap, F, T, Ax, C, S, Su, Te | 1 | |
| Typhimurium | Am, Ap, F, T, Ax, C, S, Su, Te | 1 | |
| Fed | Montevideo | Te | 11 |
| Thompson | Te | 1 | |
| Montevideo | S | 1 | |
| Kentucky | Su, Te | 1 | |
| C O7 NTb | Su, TS | 2 | |
| Reading | Am, Ap, F, T, C, S, Su, Te | 11c | |
| Newport | Am, Ap, F, T, Ax, C, S, Su, Te | 2 | |
| Reading | Am, Ap, F, T, Ax, C, S, Su, Te | 1 |
a
Am, amoxicillin-clavulanic acid; Ap, ampicillin; F, cefoxitin; K, Kanamycin; G, Gentamicin; T, ceftiofur; Ax, ceftriaxone; C, chloramphenicol; S, streptomycin; Su, sulfisoxazole; Te, tetracycline; TS, trimethoprim/sulphamethoxazole.
b
CO7 NT, nontypeable Salmonella that reacts with O-group 6,7 antisera, but H-antigens nonreactive.
c
Detected as a cluster of isolates originating from one set of 76 lymph nodes and thus may originate from a single lot of cattle at harvest.