Presence of some indicator bacteria and diarrheagenic E. coli pathotypes on jalapeno and serrano peppers from popular markets in Pachuca City, Mexico

The chili pepper is a very important crop in Mexico. Diarrheagenic E. coli pathotypes (DEPs) are important foodborne pathogens in different countries including Mexico. No data exists on DEPs presence on fresh jalapeno and serrano pepper and little data have been published on the microbiological quality of these peppers. The frequencies of coliform bacteria (CB), thermotolerant coliforms (TC), E. coli and DEPs were determined for jalapeno and serrano peppers. Of 100 serrano samples, CB, TC, E. coli and DEPs were identified in 100, 90, 58 and 36%, respectively. Of 100 jalapeno samples, CB, TC, E. coli and DEPs were identified in 100, 88, 38 and 14%, respectively. Identified DEPs included enterotoxigenic E. coli (ETEC) and Shiga toxin-producing E. coli (STEC). STEC were isolated from 36% of serrano samples and 14% of jalapeno samples. ETEC were isolated from 12% of serrano samples and 2% of jalapeno samples. Both STEC and ETEC were identified in 14 serrano samples and 2 jalapeno samples. No E. coli 0157:H7 were detected in any STEC-positive samples. jalapeno and serrano peppers could be an important factor contributing to the endemicity of DEPs-caused gastroenteritis in Mexico. (C) 2012 Elsevier Ltd. All rights reserved.