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FEMS Microbiol Lett. 2017 Jan;364(1). pii: fnw237. doi: 10.1093/femsle/fnw237. Epub 2016 Oct 14.

Genotypic heterogeneity of emetic toxin producing Bacillus cereus isolates from China.

Author information

1
Department of Microbiology, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, Zhejiang Province, China.
2
College of Food Science, Shihezi University, Shihezi 832001, Xinjiang Province, China.
3
Department of Microbiology, Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou 310051, Zhejiang Province, China llmei@cdc.zj.cn.

Abstract

Emetic toxin-producing Bacillus cereus (emetic B. cereus) is the third member of B. cereus group whose toxins are encoded by megaplasmids, beside anthrax and insecticidal toxins of B. anthracis and B. thuringiensis, respectively. A total of 18 emetic isolates collected from food poisoning events, clinical and non-random food samples in Zhejiang province of China, were analyzed by plasmid screening, pulse field gel electrophoresis, multilocus sequence typing, and toxic gene identification to investigate their genotypic diversity. In this study, 13 plasmid profile types, 14 pulse types and 6 different STs from emetic isolates were detected, in which ST 1035,1038,1053,1054 and 1065 were first assigned and reported. The toxic gene ces existed on its own, or coexisted with other toxic genes bceT, cytk, entFM and nhe, but never with hbl in emetic isolates. The results demonstrated that the emetic B. cereus strains from China were heterologous at genotypic level.

KEYWORDS:

Bacillus cereus; MLST; PFGE; emetic; plasmid profiles

PMID:
27744366
DOI:
10.1093/femsle/fnw237
[Indexed for MEDLINE]

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