Distribution of Salmonella Serovars and Antimicrobial Susceptibility from Poultry and Swine Farms in Central Vietnam

Abstract

This study was conducted to estimate the prevalence of Salmonella spp. and their antimicrobial susceptibilities on poultry and swine farms, sampled in 2 regions in Central Vietnam. A total of 67 poultry farms and 46 swine farms were sampled in a period of 5 months (from September 2012 to January 2013). Salmonella spp. was prevalent in 46.3% and 71.7% of poultry and swine farms, respectively. Altogether, 99 non-typhoidal Salmonella were isolated and the most common serovars were Salmonella Weltevreden (19%), followed by Salmonella Typhimurium (12%) and Salmonella 4,[5],12:i:- (11%). Overall, 71 of 99 (72%) Salmonella isolates were resistant to at least one of the 14 antimicrobial agents tested. Both in poultry and swine farms, high levels of resistance were observed for ampicillin, chloramphenicol, ciprofloxacin, sulphamethoxazole and tetracycline. The presence of Salmonella isolates from poultry and swine farms which were resistant to different classes of antimicrobials suggests that alternative control measures to antimicrobials should be implemented. Moreover, an effective policy should be promoted to encourage a prudent use of these agents in animal farming in Vietnam.

Antimicrobial residues and resistance against critically important antimicrobials in non-typhoidal Salmonella from meat sold at wet markets and supermarkets in Vietnam

“…Rissen was the predominant serovar in pork (9/40 isolates). This serotype has previously been found in pig production in several regions of Vietnam ( Lettini et al, 2016 , Thai et al, 2012b ). This serotype was among the most common serovars found in human patients with treatment of diarrhea in Thailand ( Angkititrakul et al, 2005 ).…”

“…This is a concern since the prevalence of resistance against ciprofloxacin and ofloxacin has ranged from 0% to 5% in previous studies ( Ta et al, 2014 , Thai et al, 2012a , Thai et al, 2012b , Van et al, 2007 ). However, high level of ciprofloxacin resistance among NTS isolates from poultry (52.2%) and swine farms (62.7%) have been reported in Central Vietnam ( Lettini et al, 2016 ). Reduction in quinolone susceptibility is reflecting the frequent use of these antimicrobials in animal husbandry ( Carrique-Mas et al, 2014 , Nhung et al, 2016 ), that is therefore considered an enormous challenge in the treatment of Salmonella infections in humans and animals ( Thai et al, 2012b ).…”

“…This is the first report confirming mcr -1 in NTS from meat (pork), although phenotypic colistin resistance has been recently reported among S . Enteritidis isolates in poultry farms ( Lettini et al, 2016 ). Although presence in a small proportion of isolates, compared with other countries (i.e.…”

Antimicrobial Usage and Antimicrobial Resistance in Animal Production in Southeast Asia: A Review

“…In three publications, AMR was investigated in both E. coli and NTS isolates. The majority of publications included data from Thailand (20) [27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44] and Vietnam (15) [18,23,45,46,47,48,49,50,51,52,53,54,55]. One publication was found with data from each of Cambodia, Indonesia, Lao PDR and Malaysia [56,57,58,59].…”

Characterization of Salmonella enterica serovars recovered from meat products legally and illegally imported into the EU reveals the presence of multiresistant and AmpC-producing isolates

“…S . Weltevreden is a common serovar in Southeast Asia and the isolate in the present study was recovered from illegally imported rabbit meat from Vietnam [ 38 , 39 ]. The isolate did not show resistances to any of the antimicrobial agents included in the test panel.…”