Volume 11, Number 5—May 2005
Dispatch
Salmonella Derby Clonal Spread from Pork
Sylvia Valdezate*
, Ana Vidal†, Silvia Herrera-León*, Javier Pozo†, Pedro Rubio†, Miguel A. Usera*, Ana Carvajal†, and M. Aurora Echeita*
, Ana Vidal†, Silvia Herrera-León*, Javier Pozo†, Pedro Rubio†, Miguel A. Usera*, Ana Carvajal†, and M. Aurora Echeita*
Table 2
Salmonella enterica* Derby strains (N = 63) from the swine group
| Swine operations/ finishing units | No. of PFGE profiles/resistance patterns | No. of PFGE profiles (no. of swine) | Resistance phenotype (no. of swine) |
|---|---|---|---|
| A-1 (6 strains) | 1/2 | 1 (5) | S,G,To,Su,T,C (1) |
| A,S,G,To,Nt,Su,T,Nx,C (4)† | |||
| A-2 (3 strains) | 1/1 | 1 (3) | A,S,G,Su,T,C (3) |
| B-3 (16 strains) | 2/7 | 1 (4) | (1)‡ |
| S,Su,T (2) | |||
| S,Su,T,C (1) | |||
| 8 (11) | (1)§ | ||
| (1)‡ | |||
| S,Su,T (8) | |||
| A,S,G,To (1) | |||
| C-4 (1 strain) | 1/1 | 1 (1) | S,Su,T (1) |
| D-5 (32 strains) | 3/3 | 1 (17) | S,Su,T (17) |
| 2 (2) | S,Su,T (2) | ||
| 21 (1) | A,S,Su,T,SxT (1) | ||
| D-6 (5 strains) | 2/4 | 22 (2) | A,S,G,T,Ap,Su,SxT,C (1) |
| A,S,G,To,Ak,Su,T,SxT,C (1) | |||
| 15 (2) | T (1) | ||
| A,S,G,To,T (1) |
*Identified in 48 swine slaughtered at 4 swine operations (A–D) and 6 finishing units (1-6) in Spain. PFGE, pulsed-field gel electrophoresis; S, streptomycin; G, gentamicin; To, tobramycin; Su, sulfamethoxazole; T, tetracycline; C, chloramphenicol; A, ampicillin; Nt, netilmicin; SxT, cotrimoxazole.
†GyrA mutation (MIC nalidixic acid/ciprofloxacin): Hys 87 = 48/0.09 μg/mL.
‡Susceptible to all antimicrobial agents tested except spectinomycin.
§Susceptible to spectinomycin.
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