Ciprofloxacin-resistant Salmonella enterica Typhimurium and Choleraesuis from Pigs to Humans, Taiwan

Po Ren Hsueh, Lee Jene Teng, Sung Pin Tseng, Chao Fu Chang, Jen Hsien Wan, Jing Jou Yan, Chun Ming Lee, Yin Ching Chuang, Wen Kuei Huang, Dine Yang, Jainn Ming Shyr, Kwok Woon Yu, Li Shin Wang, Jang Jih Lu, Wen Chien Ko, Jiunn Jong Wu, Feng Yee Chang, Yi Chueh Yang, Yeu Jun Lau, Yung Ching LiuCheng Yi Liu, Shen Wu Ho, Kwen Tay Luh

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Abstract

We evaluated the disk susceptibility data of 671 nontyphoid Salmonella isolates collected from different parts of Taiwan from March 2001 to August 2001 and 1,261 nontyphoid Salmonella isolates from the National Taiwan University Hospital from 1996 to 2001. Overall, ciprofloxacin resistance was found in 2.7% (18/671) of all nontyphoid Salmonella isolates, in 1.4% (5/347) of Salmonella enterica serotype Typhimurium and in 7.5% (8/107) in S. enterica serotype Choleraesuis nationwide. MICs of six newer fluoroquinolones were determined for the following isolates: 37 isolates of ciprofloxacin-resistant (human) S. Typhimurium (N = 26) and Choleraesuis (N = 11), 10 isolates of ciprofloxacin-susceptible (MIC 0.12 μg/mL). Sequence analysis of the gryA, gyrB, parC, parE, and acrR genes, ciprofloxacin accumulation, and genotypes generated by pulsed-field gel electrophoresis with three restriction enzymes (SpeI, XbaI, and BlnI) were performed. All 26 S. Typhimurium isolates from humans and pigs belonged to genotype I. For S. Choleraesuis isolates, 91% (10/11) of human isolates and 54% (7/13) of swine isolates belonged to genotype B. These two genotypes isolates from humans all exhibited a high-level of resistance to ciprofloxacin (MIC 16-64 mg/mL). They had two-base substitutions in the gyrA gene at codons 83 (Ser83Phe) and 87 (Asp87Gly or Asp87Asn) and in the parC gene at codon 80 (Ser80Arg, Ser80Ile, or Ser84Lys). Our investigation documented that not only did these two S. enterica isolates have a high prevalence of ciprofloxacin resistance nationwide but also that some closely related ciprofloxacin-resistant strains are disseminated from pigs to humans.

Original languageEnglish
Pages (from-to)60-68
Number of pages9
JournalEmerging Infectious Diseases
Volume10
Issue number1
Publication statusPublished - Jan 2004
Externally publishedYes

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ASJC Scopus subject areas

  • Microbiology (medical)

Cite this

Hsueh, P. R., Teng, L. J., Tseng, S. P., Chang, C. F., Wan, J. H., Yan, J. J., Lee, C. M., Chuang, Y. C., Huang, W. K., Yang, D., Shyr, J. M., Yu, K. W., Wang, L. S., Lu, J. J., Ko, W. C., Wu, J. J., Chang, F. Y., Yang, Y. C., Lau, Y. J., ... Luh, K. T. (2004). Ciprofloxacin-resistant Salmonella enterica Typhimurium and Choleraesuis from Pigs to Humans, Taiwan. Emerging Infectious Diseases, 10(1), 60-68.