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Volume 10, Number 5—May 2004

Research

Multidrug-resistant Strains of Salmonella enterica Typhimurium, United States, 1997–19981

Therese Rabatsky-Ehr*Comments to Author , Jean M. Whichard†, Shannon Rossiter†, Ben Holland†, Karen Stamey†, Marcia L. Headrick‡, Timothy J. Barrett†, Frederick J. Angulo†, and the NARMS Working Group
Author affiliations: *Yale University School of Medicine, New Haven, Connecticut, USA; †Centers for Disease Control and Prevention, Atlanta, Georgia, USA; ‡U.S. Food and Drug Administration, Bethesda, Maryland, USA

Main Article

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.

Main Article

1Presented in part at the International Conference on Emerging Infectious Diseases, July 2000, Atlanta, Georgia, USA.

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