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Multilocus sequence type profiles of Bacillus cereus isolates from infant formula in China

Author:
Yang, Yong, Yu, Xiaofeng, Zhan, Li, Chen, Jiancai, Zhang, Yunyi, Zhang, Junyan, Chen, Honghu, Zhang, Zheng, Zhang, Yanjun, Lu, Yiyu, Mei, Lingling
Source:
Food microbiology 2017 v.62 pp. 46-50
ISSN:
0740-0020
Subject:
Bacillus cereus, alleles, databases, food pathogens, goat milk, infant formulas, multilocus sequence typing, China
Abstract:
Bacillus cereus sensu stricto is an opportunistic foodborne pathogen. The multilocus sequence type (MLST) of 74 B. cereus isolated from 513 non-random infant formula in China was analyzed. Of 64 sequence types (STs) detected, 50 STs and 6 alleles were newly found in PubMLST database. All isolates except for one singleton (ST-1049), were classified into 7 clonal complexes (CC) by BURST (n-4), in which CC1 with core ancestral clone ST-26 was the largest group including 86% isolates, and CC2, 3, 9, 10 and 13 were first reported in China. MLST profiles of the isolates from 8 infant formula brands were compared. It was found the brands might be potentially tracked by the variety of STs, such as ST-1049 of singleton and ST-1062 of isolate from goat milk source, though they could not be easily tracked just by clonal complex types of the isolates.