PCR Detection of Salmonella enterica Serotype Montevideo in and on Raw Tomatoes Using Primers Derived from hilA

AUTOR(ES)

Guo, Xuan

FONTE

American Society for Microbiology

RESUMO

Salmonellae have been some of the most frequently reported etiological agents in fresh-produce-associated outbreaks of human infections in recent years. PCR assays using four innovative pairs of primers derived from hilA and sirA, positive regulators of Salmonella invasive genes, were developed to identify Salmonella enterica serotype Montevideo on and in tomatoes. Based on examination of 83 Salmonella strains and 22 non-Salmonella strains, we concluded that a pair of hilA primers detects Salmonella specifically. The detection limits of the PCR assay were 101 and 100 CFU/ml after enrichment at 37°C for 6 and 9 h, respectively. When the assay was validated by detecting S. enterica serotype Montevideo in and on artificially inoculated tomatoes, 102 and 101 CFU/g were detected, respectively, after enrichment for 6 h at 37°C. Our results suggest that the hilA-based PCR assay is sensitive and specific, and can be used for rapid detection of Salmonellae in or on fresh produce.

Documentos Relacionados

• Detection of hilA gene sequences in serovars of Salmonella enterica sufigbspecies enterica
• Roles of hilC and hilD in Regulation of hilA Expression in Salmonella enterica Serovar Typhimurium
• Multiple Factors Independently Regulate hilA and Invasion Gene Expression in Salmonella enterica Serovar Typhimurium
• HilE Interacts with HilD and Negatively Regulates hilA Transcription and Expression of the Salmonella enterica Serovar Typhimurium Invasive Phenotype
• Contribution of the RpoA C-Terminal Domain to Stimulation of the Salmonella enterica hilA Promoter by HilC and HilD