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Rapid detection and specific differentiation of Salmonella enterica subsp. enterica Enteritidis, Typhimurium and its monophasic variant 4,,12:i:− by real-time multiplex PCR
- Maurischat, Sven, Baumann, Beatrice, Martin, Annett, Malorny, Burkhard
- International journal of food microbiology 2015 v.193 pp. 8-14
- European Union, Salmonella enterica subsp. enterica, chickens, diseases and disorders (animals and humans), hosts, microbiological criteria, neck, pathogens, probability, quantitative polymerase chain reaction, rapid methods, raw meat, serotypes
- Salmonella enterica is one of the most common zoonotic pathogens worldwide causing clinical diseases in human and animal hosts. Targeting a reduction of Salmonella prevalence in poultry, the EU set up a microbiological criterion that demands the absence of S. enterica subsp. enterica serovars Enteritidis and Typhimurium including its monophasic variant with seroformula 4,,12:i:− in 25g of poultry neck skin samples and fresh meat according to regulation (EU) no 1086/2011. We developed and in-house validated a method that detects and differentiates these Salmonella serovars based on a 5-plex real-time PCR assay within 24h after sampling. The inclusivity and exclusivity were between 98 and 99% analysing 456 bacterial strains. Validation according to ISO 16140:2003 against the traditional cultural reference method ISO 6579:2002 was performed using 60 artificially contaminated and 31 presumably naturally contaminated chicken neck skin samples resulting in a relative accuracy of 100%. The detection probability reached 100% between 3 and 5CFU/25g sample. We were also able to assign rough and non-motile strains to S. enterica subsp. enterica serovars Enteritidis and Typhimurium. In conclusion, we provide diagnostic laboratories a fast and accurate method to monitor these Salmonella serovars in chicken neck skin samples. Other matrices could be easily adapted.