Occurrence of Enterobacteriaceae with Serological Cross Reactivity towards Salmonella spp., Shigella spp. and Vibrio cholerae in Food
Md. Fakruddin
Industrial Microbiology Laboratory, Institute of Food Science and Technology (IFST), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka, Bangladesh
Md. Mizanur Rahaman
Industrial Microbiology Laboratory, Institute of Food Science and Technology (IFST), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka, Bangladesh and Department of Microbiology, University of Dhaka, Bangladesh.
Monzur Morshed Ahmed *
Industrial Microbiology Laboratory, Institute of Food Science and Technology (IFST), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka, Bangladesh.
Md. Mahfuzul Hoque
Department of Microbiology, University of Dhaka, Bangladesh
*Author to whom correspondence should be addressed.
Abstract
Aims: This study was conducted to determine the occurrence of serologically cross-reactive enterobacteriaceae in food samples.
Place and Duration of Study: This study was conducted in Industrial Microbiology Laboratory, IFST, BCSIR, Dhaka, Bangladesh during January-November, 2013.
Methodology: 14 Enterobacteriaceae was isolated from food samples and identified. Serological reaction was determined by slide agglutination method.
Results: Among 14 isolates, 6 were identified to be Cronobacter spp., 3 to be Shigella spp., 2 to be Enterobacter spp., 2 to be Escherichia coli and 1 as Klebsiella spp. Three of the isolates belonging to Cronobacter showed extremely strong cross-reactivity with Salmonella spp., Shigella spp. and Vibrio cholerae. Other isolates gave relatively weak but significant cross-reactions. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) of cell surface protein also showed similar bands in the isolates as type strains of Salmonella, Shigella and Vibrio cholerae.
Conclusion: The results indicate that Salmonella spp., Shigella spp. and Vibrio cholerae surface antigens are shared by Enterobacteriaceae present in food.
Keywords: Enterobacteriaceae, serological, cross-reactivity, food