Matrix Extension Study: Validation of the ANSR® Salmonella Method for Detection of Salmonella spp. in Pasteurized Egg...

A matrix extension study was conducted to validate the ANSR(®) Salmonella method for use with pasteurized egg products. Four diverse egg product types were tested by the ANSR method and the U.S. Department of Agriculture's Microbiology Laboratory Guidebook reference culture procedure. There were no significant differences in the number of positive test portions by the two methods for any of the products examined. Independent laboratory testing of pasteurized liquid egg also found no significant difference in performance between the ANSR and reference culture procedures. There were no false-positive results obtained in either internal or independent laboratory testing. Inclusivity testing using a new enrichment medium specifically designed for use with pasteurized egg products produced 112 positive results out of 113 Salmonella spp. strains tested, with only a single strain of S. Weslaco testing negative by the ANSR assay. Exclusivity testing of 38 non-salmonellae produced all negative ANSR results. It is concluded that ANSR Salmonella is a reliable, sensitive, and specific method for detection of Salmonella spp. in pasteurized egg products.