Volume 15, Number 1—January 2009
Dispatch
Variation in Antimicrobial Resistance in Sporadic and Outbreak-related Salmonella enterica Serovar Typhimurium
Eva Møller Nielsen
, Mia Torpdahl, Steen Ethelberg, and Anette M. Hammerum
, Mia Torpdahl, Steen Ethelberg, and Anette M. Hammerum
Table 2
Characterization of Salmonella genomic island 1 in isolates with atypical antimicrobial-drug phenotype and isolates likely to be related (possible clusters or outbreaks)*
| Outbreak (no. isolates) | MLVA profile | PFGE pattern | Phenotype | SGI1 variant | Left/right junction | intI1 L1-R1 1.0/1.2 kb | pse-1 | florR | aadA2 | qac/ sul1 | tet(G) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Carpaccio outbreak 1 (33) | 253 | 205 | ACSSuT | SGI1 | +/+ | +/+ | + | + | + | + | + |
| Carpaccio outbreak 2 (3) | 253 | 205 | ASu | SGI1-B | +/+ | −/+ | + | − | − | + | − |
| Pork outbreak 2003–2004 (18) | 133 | 14 | ASu | SGI1-B | +/+ | −/+ | + | − | − | + | − |
| Jun 2003 “cluster” (2) | 437 | 14 | ASu | SGI1-B | +/+ | −/+ | + | − | − | + | − |
| Jun 2003 (1) | 437 | 14 | ACSSuT | SGI1 | +/+ | +/+ | + | + | + | + | + |
| Oct 2005–Jan 2006 (8) | 443 | 14 | SSu | SGI1-C | +/+ | +/− | − | − | + | + | − |
| Jan 2006 (1) | 443 | 14 | ASSuTTm† | SGI1-C | +/+ | +/− | − | − | + | + | − |
| Dec 2003 (1) | 309 | 14 | ASSu‡ | SGI1-B | +/+ | −/+ | + | − | − | + | − |
| Sep 2006 (1) | 270 | nd | ACST | (SGI1) | +/+ | +/+ | + | + | + | + | + |
| Aug 2003 (3) | 681 | 14 | SSuT§ | − | − | − | − | − | − | − | − |
| 2003–2006 (8) | Various | Various | Sensitive | − | − | − | − | − | − | − | − |
*MLVA, multilocus variable number of tandem repeats analysis; PFGE, pulsed-field gel electrophoresis.
†Other genes detected by PCR: bla, strAB, and tet(B).
‡Other genes detected by PCR: strAB and sul2.
§Other genes detected by PCR: strAB sul2, and tet(A).
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