A Cross-Sectional Study of Salmonella in Pork Products in Chiang Mai, Thailand

Abstract

The occurrence of Salmonella in food of animal origin in Chiang Mai province was investigated by using a cross-sectional study during several phases of the pork production chain (cutting, transport, and retail) and of the environment in the cutting unit of a slaughterhouse. In total, 173 pork samples were obtained during the cutting phase, 173 samples from transported pork, 200 samples from retail products, and 300 samples from the slaughterhouse environment. Salmonella was detected in 55.5% of freshly cut pork, 70.5% of transported pork, and 34.5% of retail products. The five most prevalent Salmonella serotypes identified were Rissen (45.3%), Typhimurium (16.3%), Krefeld (10.6%), Stanley (6.3%), and Lagos (6.0%). Carcass contamination prior to cutting and in the slaughterhouse environment appeared to be important sources of Salmonella in transported pork and retail products. As Salmonella was also found during early stages of the slaughter process, attention should focus on all stages of the pork production chain to reduce contamination level and consumer risk of infection.

Characterization of Isolates of Salmonella enterica Serovar Stanley, a Serovar Endemic to Asia and Associated with Travel

“…This serovar accounted for 1.9% (n ϭ 64) of salmonellosis cases in 1993 and 10.1% of cases (n ϭ 141) in 2003 (23). Salmonella serovar Stanley is a serovar generally associated with pig and pork production but is neither host restricted nor host adapted (16,33).…”

Comparative Phenotypic and Genotypic Analyses of Salmonella Rissen that Originated from Food Animals in Thailand and United States

“…Salmonella enterica serovar Rissen is reported to be among the most frequent serotypes found in Thailand and remains in swineherds for extended periods of time (Dorn‐in et al., ). This serotype is also the most prevalent serotype isolated from pork carcasses and ready‐to‐eat products in Thailand and has been shown to efficiently transmit from swine to humans during food production and processing (Sanguankiat et al., ). Hendriksen et al.…”

“…In Thailand, S . Rissen is the most prevalent serotype isolated from swine and pork products (Dorn‐in et al., ; Sanguankiat et al., ). Small numbers of both human and food animal salmonellosis cases due to S .…”

Whole-Genome Comparative and Pathogenicity Analysis of Salmonella enterica subsp. enterica Serovar Rissen

“…In recent years, Salmonella enterica serovar Rissen (S. Rissen) has become a common serotype found in swine herds, pork and chicken products and gastrointestinal human patients throughout different regions of the world (Darwin and Miller 1999;Lee et al 2016;Saito et al 2016). In Thailand, S. Rissen is the most prevalent serotype isolate from swine and pork products (Dorn-In et al 2009;Sanguankiat et al 2010). Salmonellosis cases owing to S. Rissen infections in Europe (Garrido et al 2015;Bonardi et al 2016;Campos et al 2016;Frasson et al 2016) and America (Blondel et al 2015;Molina et al 2016) have been reported.…”

“…In Thailand, S . Rissen is the most prevalent serotype isolate from swine and pork products ( Dorn-In et al 2009 ; Sanguankiat et al 2010 ). Salmonellosis cases owing to S .…”