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Volume 12, Number 2—February 2006

Letter

Fluoroquinolone-resistant Salmonella sp. in Carcasses

Yu-Chih Wang*, Kuang-Sheng Yeh†, Chao-Chin Chang*, Shih-Ling Hsuan*, and Ter-Hsin Chen*Comments to Author 
Author affiliations: *National Chung Hsing University, Taichung, Taiwan; †Taipei Medical University, Taipei, Taiwan

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Table

Characteristics of ciprofloxacin-resistant Salmonella enterica serovar Schwarzengrund strains from carcasses*†

Strain no. Origin* Year isolated Antimicrobial drug resistance profile Quinolone MICs (μg/mL)
Substitutions in QRDR‡
NAL FLU ENR CIP gyrA parC parE
A5 B, M 2000 CmSxtTc 1,024 512 32 8 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg Ser458Pro
A16 P, E 2000 ApCmNSxtTc 2,048 512 32 8 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg Ser458Pro
A17 P, E 2000 ApCmNSxtTc 2,048 512 32 16 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg Ser458Pro
A18 P, E 2000 ApCmNSxtTc 2,048 512 32 16 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg Ser458Pro
A19 P, E 2000 ApCmCnNSxtTc 1,024 512 32 8 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg Ser458Pro
A20 P, E 2000 ApCmNSxtTc 2,048 512 32 8 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg Ser458Pro
A29 B, S 2000 CmNSxtTc 1,024 512 32 8 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg Ser458Pro
A36 B, S 2000 ApCmSxtTc 1,024 512 32 8 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg Ser458Pro
A41 P, S 2000 ApCmCnNSxtTc 1,024 512 32 16 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg Ser458Pro
A45 P, S 2000 ApCmNSxtTc 1,024 512 32 16 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg
A51 P, S 2000 ApCmCnNSxtTc 1,024 512 16 4 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg
A56 B, M 2000 ApCmCnNSxtTc 2,048 512 64 16 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg
A61 P, S 2000 CmSxtTc 1,024 512 32 8 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg Ser458Pro
A62 P, S 2000 ApCmCnSxtTc 2,048 512 64 16 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg
B16 P, E 2001 ApCmCnCroTc 2,048 512 32 16 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg Ser458Pro
B73 P, N 2003 ApCmCnNSxtTc 2,048 512 32 16 Ser83Phe;
Asp87Gly Thr57Ser;
Ser80Arg Ser458Pro

*QRDR, quinolone resistance–determining region; B, broiler; M, middle Taiwan; P, pork; E, east Taiwan; S, south Taiwan; N, north Taiwan.
†Antimicrobial agents are ampicillin (Ap), chloramphenicol (Cm), ciprofloxacin (CIP), enrofloxacin (ENR), flumequine (FLU), gentamicin (Cn), ceftriaxone (Cro), nalidixic acid (NAL),neomycin (N), trimethoprim/sulfamethoxazole (Sxt), and tetracycline (Tc).
‡No gyrB substitutions were detected.

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