Volume 10, Number 5—May 2004
Research
Multidrug-resistant Strains of Salmonella enterica Typhimurium, United States, 1997–19981
Therese Rabatsky-Ehr*
, Jean M. Whichard†, Shannon Rossiter†, Ben Holland†, Karen Stamey†, Marcia L. Headrick‡, Timothy J. Barrett†, Frederick J. Angulo†, and the NARMS Working Group
, Jean M. Whichard†, Shannon Rossiter†, Ben Holland†, Karen Stamey†, Marcia L. Headrick‡, Timothy J. Barrett†, Frederick J. Angulo†, and the NARMS Working Group
Table 1
R-type and phage type distribution among Salmonella Typhimurium isolates, NARMS 1997–1998
| R-typea | All isolates N (%) | DT104 N (%) | RDNC† N (%) | Untypeable N (%) |
|---|---|---|---|---|
| ACSSuT |
187 (27) |
160 (62) |
6 (3) |
6 (6) |
| ACSSuT+Cl |
11 (1) |
10 (4) |
0 |
0 |
| ACSSuT+G |
2 (<1) |
2 (<1) |
0 |
0 |
| ACSSuT+N |
4 (<1) |
4 (2) |
0 |
0 |
| ACSSuT+Tm |
1 (<1) |
0 |
0 |
0 |
| ACSSuT+Cl+Cep |
2 (<1) |
1 (<1) |
0 |
0 |
| ACSSuT+Cl+Tm |
1 (<1) |
1 (<1) |
0 |
0 |
| ACSSuT+Cl+Cef+Cx+Cep |
1 (<1) |
1 (<1) |
0 |
0 |
| ACSSuT total |
209 (30) |
179 (69) |
6 (3) |
6 (6) |
| ACKSSuT |
16 (2) |
13 (5) |
1 (<1) |
2 (2) |
| ACKSSuT+Cep+Tm |
4 (<1) |
0 |
0 |
4 (4) |
| ACKSSuT+Cl+Cef+Cx+Cep |
3 (<1) |
0 |
0 |
3 (3) |
| ACKSSuT+Cl+Cef+Cx+Cep+G |
2 (<1) |
1 (<1) |
0 |
1 (1) |
| ACKSSuT+Cl+Cef+Cx+Cep+G+Tm |
1 (<1) |
0 |
0 |
1 (1) |
| ACKSSuT total |
26 (4) |
14 (5) |
1 (<1) |
11 (11) |
| AKSSuT |
51 (7) |
5 (2) |
8 (4) |
34 (33) |
| AKSSuT+Cep |
4 (<1) |
1 (<1) |
1 (<1) |
2 (2) |
| AKSSuT+G |
1 (<1) |
0 |
1 (<1) |
0 |
| AKSSuT+Cl+Cep |
1 (<1) |
0 |
0 |
0 |
| AKSSuT+Cep+G |
2 (<1) |
2 (<1) |
0 |
0 |
| AKSSuT+Cl+Cep+G |
1 (<1) |
1 (<1) |
0 |
0 |
| AKSSuT+Cef+Cx+Cep+N |
1 (<1) |
0 |
0 |
1 (1) |
| AKSSuT total |
61 (9) |
9 (4) |
10 (5) |
37 (36) |
| Pansusceptible |
295 (42) |
33 (13) |
144 (69) |
26 (25) |
| Resistant to 1 antimicrobial agent |
23 (3) |
5 (2) |
11 (5) |
3 (3) |
| Resistant to 2 antimicrobial agents |
19 (3) |
7 (3) |
8 (4) |
1 (1) |
| Resistant to 3 antimicrobial agents |
21 (3) |
4 (2) |
10 (5) |
4 (4) |
| Resistant to 4 antimicrobial agents |
27 (4) |
5 (2) |
11 (5) |
10 (10) |
| Resistant to 5 antimicrobial agents |
6 (<1) |
3 (1) |
2 (1) |
1 (1) |
| Resistant to 6 antimicrobial agents |
4 (<1) |
0 |
1 (<1) |
0 |
| Resistant to 7 antimicrobial agents |
5 (<1) |
0 |
2 (1) |
1 (1) |
| Resistant to 9 antimicrobial agents |
1 (<1) |
0 |
0 |
1 (1) |
| Total | 697 (100) | 259 (100) | 209 (100) | 104 (100) |
aNARMS, National Antimicrobial Resistance Monitoring System; Cl, amoxicillin-clavulanic acidl; A, ampicillin; Ceft, ceftiofur; Cx, ceftriaxone; Cep, cephalothin; C, chloramphenicol; G, .gentamicin; K, kanamycin; N, nalidixic acid; S, streptomycin; Su, sulfamethoxazole; T, tetracycline; Tm, trimethoprim-sulfamethoxazole.
bReacts but does not conform.
1Presented in part at the International Conference on Emerging Infectious Diseases, July 2000, Atlanta, Georgia, USA.
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