High levels of contamination and antimicrobial-resistant non-typhoidal Salmonella serovars on pig and poultry farms in the Mekong Delta of Vietnam


Tu, LTP; Hoang, NVM; Cuong, NV; Campbell, J; Bryant, JE; Hoa, NT; Kiet, BT; Thompson, C; Duy, DT; Phat, VV; Hien, VB; Thwaites, G; Baker, S; Carrique-Mas, JJ; (2015) High levels of contamination and antimicrobial-resistant non-typhoidal Salmonella serovars on pig and poultry farms in the Mekong Delta of Vietnam. Epidemiology and infection, 143 (14). pp. 3074-3086. ISSN 0950-2688 DOI: 10.1017/S0950268815000102

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Abstract

We investigated the prevalence, diversity, and antimicrobial resistance (AMR) profiles of non-typhoidal Salmonella (NTS) and associated risk factors on 341 pig, chicken, and duck farms in Dong Thap province (Mekong Delta, Vietnam). Sampling was stratified by species, district (four categories), and farm size (three categories). Pooled faeces, collected using boot swabs, were tested using ISO 6575: 2002 (Annex D). Isolates were serogrouped; group B isolates were tested by polymerase chain reaction to detect S. Typhimurium and (monophasic) serovar 4,[5], 12:i:-variants. The farm-level adjusted NTS prevalence was 64.7%, 94.3% and 91.3% for chicken, duck and pig farms, respectively. Factors independently associated with NTS were duck farms [odds ratio (OR) 21.2], farm with >50 pigs (OR 11.9), pig farm with 5-50 pigs (OR 4.88) (vs. chickens), and frequent rodent sightings (OR 2.3). Both S. Typhimurium and monophasic S. Typhimurium were more common in duck farms. Isolates had a high prevalence of resistance (77.6%) against tetracycline, moderate resistance (20-30%) against chloramphenicol, sulfamethoxazole-trimethoprim, ampicillin and nalidixic acid, and low resistance (<5%) against ciprofloxacin and third-generation cephalosporins. Multidrug resistance (resistance against >= 3 classes of antimicrobial) was independently associated with monophasic S. Typhimurium and other group B isolates (excluding S. Typhimurium) and pig farms. The unusually high prevalence of NTS onMekong Delta farms poses formidable challenges for control.

Item Type: Article
Faculty and Department: Faculty of Infectious and Tropical Diseases > Dept of Pathogen Molecular Biology
PubMed ID: 25778282
Web of Science ID: 362955500018
URI: http://researchonline.lshtm.ac.uk/id/eprint/2344781

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