Foods 2014, 3(1), 82-93; doi:10.3390/foods3010082
Article

Molecular Typing of Campylobacter jejuni and Campylobacter coli Isolated from Various Retail Meats by MLST and PFGE

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Received: 2 December 2013; in revised form: 24 December 2013 / Accepted: 2 January 2014 / Published: 8 January 2014
(This article belongs to the Special Issue Food Microbiology and Safety)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Campylobacter species are one of the leading causes of foodborne disease in the United States. Campylobacter jejuni and Campylobacter coli are the two main species of concern to human health and cause approximately 95% of human infections. Molecular typing methods, such as pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST) are often used to source track foodborne bacterial pathogens. The aim of the present study was to compare PFGE and MLST in typing strains of C. jejuni and C. coli that were isolated from different Oklahoma retail meat sources. A total of 47 Campylobacter isolates (28 C. jejuni and 19 C. coli) isolated from various retail meat samples (beef, beef livers, pork, chicken, turkey, chicken livers, and chicken gizzards) were subjected to pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST). PFGE was able to group the 47 Campylobacter isolates into two major clusters (one for C. jejuni and one for C. coli) but failed to differentiate the isolates according to their source. MLST revealed 21 different sequence types (STs) that belonged to eight different clonal complexes. Twelve of the screened Campylobacter isolates (8 C. jejuni and 4 C. coli) did not show any defined STs. All the defined STs of C. coli isolates belonged to ST-828 complex. The majority of C. jejuni isolates belonged to ST-353, ST-607, ST-52, ST-61, and ST-21 complexes. It is worthy to mention that, while the majority of Campylobacter isolates in this study showed STs that are commonly associated with human infections along with other sources, most of the STs from chicken livers were solely reported in human cases. In conclusion, retail meat Campylobacter isolates tested in this study particularly those from chicken livers showed relatedness to STs commonly associated with humans. Molecular typing, particularly MLST, proved to be a helpful tool in suggesting this relatedness to Campylobacter human isolates.
Keywords: Campylobacter; MLST; PFGE; molecular typing; retail meats; poultry; beef; pork; livers; foodborne pathogens
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MDPI and ACS Style

Noormohamed, A.; Fakhr, M.K. Molecular Typing of Campylobacter jejuni and Campylobacter coli Isolated from Various Retail Meats by MLST and PFGE. Foods 2014, 3, 82-93.

AMA Style

Noormohamed A, Fakhr MK. Molecular Typing of Campylobacter jejuni and Campylobacter coli Isolated from Various Retail Meats by MLST and PFGE. Foods. 2014; 3(1):82-93.

Chicago/Turabian Style

Noormohamed, Aneesa; Fakhr, Mohamed K. 2014. "Molecular Typing of Campylobacter jejuni and Campylobacter coli Isolated from Various Retail Meats by MLST and PFGE." Foods 3, no. 1: 82-93.

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