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Presence of non‐ O157 Shiga toxin‐producing Escherichia coli , enterotoxigenic E. coli , enteropathogenic E. coli and Salmonella in fresh beetroot ( Beta vulgaris L.) juice from public markets in Mexico
Author(s) -
GómezAldapa Carlos A,
RangelVargas Esmeralda,
BautistaDe León Haydee,
CastroRosas Javier
Publication year - 2014
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.6614
Subject(s) - salmonella , pasteurization , food science , enterotoxigenic escherichia coli , microbiology and biotechnology , salmonella enterica , escherichia coli , biology , enteropathogenic escherichia coli , food microbiology , bacteria , enterotoxin , biochemistry , genetics , gene
Abstract BACKGROUND Unpasteurized juice has been associated with foodborne illness outbreaks for many years. Beetroot is a vegetable grown all over the world in temperate areas. In Mexico beetroot is consumed cooked in salads or raw as fresh unpasteurized juices. No data about the microbiological quality or safety of unpasteurized beetroot juices are available. Indicator bacteria, diarrheagenic Escherichia coli pathotypes ( DEP ) and Salmonella frequencies were determined for fresh unpasteurized beetroot juice from restaurants . RESULTS One hundred unpasteurized beetroot juice samples were collected from public markets in Pachuca, Mexico. Frequencies in these samples were 100%, 75%, 53%, 9% and 4% of positive samples, for coliform bacteria, fecal coliforms, E. coli , DEP and Salmonella , respectively. Identified DEP included enterotoxigenic E. coli ( ETEC ), enteropathogenic E. coli ( EPEC ) and non‐ O157 Shiga toxin‐producing E. coli ( STEC ). Identified Salmonella serotypes included Typhimurium and Enteritidis . CONCLUSION This is the first report of microbiological quality and atypical EPEC , ETEC , non‐ O157 STEC and Salmonella isolation from fresh raw beetroot juice in Mexico. Fresh raw beetroot juice from markets is very probably an important factor contributing to the endemicity of atypical EPEC , ETEC , non‐ O157 STEC and Salmonella ‐related gastroenteritis in Mexico. © 2014 Society of Chemical Industry