Most Pobable Number-Polymerase Chain Reaction-based Quantification of Escherichia coli O26, O104, O111, and O157 from Thai and Imported Malaysian Beef
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Abstract
The contamination of Escherichia coli O157 and non-O157 groups in foods has been reported to cause sporadic cases and outbreaks, resulting in significant economic and social losses worldwide. In this study, the prevalence of E. coli O26, O104, O111, and O157 in retail beef samples from either domestic Thai or imported Malaysian sources was investigated and their amounts were quantified using the MPN-PCR approach. Of the 102 samples, E. coli O26, O104, O111, and O157, were found in beef at rates of 57%, 6%, 0%, and 17%, respectively, with serotype O26 showing the highest contamination rate among the sample (P-value < 0.05). Among the positive samples investigated, the lowest MPN/g value were less than 3 for all serotypes, while the highest MPN/g values of E. coli O26, O104, O111, and O157, were 75, 93, < 3, and 27, respectively. Immuno-magnetic separation technique was also employed to confirm the lack of E. coli O111 in beef. The high level of E. coli O157 and non-O157 contamination in beef observed in this study are thought to pose health risks to consumers, making the finding crucial from a public health standpoint.
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