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Zhang Y, Wang Y, Cai R, Shi L, Li C, Yan H. Prevalence of Enterotoxin Genes in Staphylococcus aureus Isolates from Pork Production. Foodborne Pathog Dis 2018; 15:437-443. [PMID: 29672171 DOI: 10.1089/fpd.2017.2408] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
In this study, 130 Staphylococcus aureus isolates from samples associated with pork production were tested for prevalence of 18 staphylococcal enterotoxin (SE) genes. Approximately 94.6% (123/130) of isolates from different stages of pork production harbored one or more SE genes forming 37 different enterotoxin gene profiles. Seb was present in 60.0% of the S. aureus isolates, the highest among the genes tested. The genes, sed, sej, seo, sep, ser, and seu, were not found. The five classical SE genes (including sea, seb, sec, sed, see) had lower prevalence than the egc gene cluster (seg, sei, sem, sen, seo, or seu). Notably, ∼6.9% (9/130) isolates harbored five SE genes. Classical SE genes were relatively higher in raw meat isolates than swine farm isolates, suggesting that raw meat isolates have a greater potential for classical staphylococcal food poisoning. Incomplete egc clusters were mainly distributed in swine farm isolates, and some of them coexisted with other classical SE genes (seb, sec), showing that swine farms could be potential sources of enterogenic S. aureus of food safety concern. Characterizing the distributions of enterotoxin genes among S. aureus may provide epidemiological information for the benefit of public health and food safety.
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Affiliation(s)
- Yang Zhang
- 1 School of Food Science and Engineering, South China University of Technology , Guangzhou, China
| | - Yage Wang
- 1 School of Food Science and Engineering, South China University of Technology , Guangzhou, China
| | - Rujian Cai
- 2 Institute of Animal Health Guangdong Academy of Agricultural Sciences , Guangzhou, China
| | - Lei Shi
- 3 Institute of Food Safety and Nutrition, Jinan University , Guangzhou, China .,4 State Key Laboratory of Food Safety Technology for Meat Products, Fujian, China
| | - Chunling Li
- 2 Institute of Animal Health Guangdong Academy of Agricultural Sciences , Guangzhou, China
| | - He Yan
- 1 School of Food Science and Engineering, South China University of Technology , Guangzhou, China .,4 State Key Laboratory of Food Safety Technology for Meat Products, Fujian, China
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Umeda K, Nakamura H, Yamamoto K, Nishina N, Yasufuku K, Hirai Y, Hirayama T, Goto K, Hase A, Ogasawara J. Molecular and epidemiological characterization of staphylococcal foodborne outbreak of Staphylococcus aureus harboring seg, sei, sem, sen, seo, and selu genes without production of classical enterotoxins. Int J Food Microbiol 2017; 256:30-35. [PMID: 28582663 DOI: 10.1016/j.ijfoodmicro.2017.05.023] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 05/26/2017] [Accepted: 05/29/2017] [Indexed: 10/19/2022]
Abstract
Staphylococcal food poisoning is the result of consumption of food contaminated with staphylococcal enterotoxins (SEs) produced by Staphylococcus aureus. To date, 23 SEs and SE-like enterotoxins (SEls) have been described in the literature. They are divided into classical SEs (SEA-SEE) and new SE/SEls (SEG-SElX). Some have proved to be foodborne-inducible, but others remain unidentified. In May 2016, at an elderly group home in Osaka city, Japan, an outbreak from foodborne pathogens occurred among lunch party participants. Within 2h 30min to 4h 40min, 15 of 53 participants presented gastrointestinal symptoms of vomiting, diarrhea, and nausea. A subsequent laboratory investigation detected S. aureus from most stool samples from patients, several left-over food items, a kitchen swab, and hand swabs from two food handlers. Classical SEs was not detected from S. aureus isolates or left-over food items. From examination for the presence of SE/SEl genes of 20 kinds by PCR, seg, sei, sem, sen, seo, and selu genes were detected in almost all isolates. These isolates exhibited identical or closely related types by coagulase type (type VII), Sma I digested pulsed-field gel electrophoresis analysis and multi-locus sequence typing (MLST-CC45 lineage). These results suggest that the foodborne outbreak was caused by S. aureus harboring seg, sei, sem, sen, seo, and selu genes without production of classical SEs. Additionally, some S. aureus isolates from human nasal swabs and healthy human feces harboring seg, sei, sem, sen, seo, and selu genes without production of classical SEs were classified into CC45 lineage using MLST. These findings suggest new SE/SEls as a potential cause of foodborne outbreaks.
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Affiliation(s)
- Kaoru Umeda
- Division of Microbiology, Osaka Institute of Public Health, 8-34, Tojo-cho, Tennoji-ku, Osaka 543-0026, Japan.
| | - Hiromi Nakamura
- Division of Microbiology, Osaka Institute of Public Health, 8-34, Tojo-cho, Tennoji-ku, Osaka 543-0026, Japan
| | - Kaori Yamamoto
- Division of Microbiology, Osaka Institute of Public Health, 8-34, Tojo-cho, Tennoji-ku, Osaka 543-0026, Japan
| | - Nobuko Nishina
- Osaka City Public Health Center, Southeast Living and Health Inspection Office, 1-2-7, Asahi-cho, Abeno-ku, Osaka 545-0051, Japan
| | - Kiyoshi Yasufuku
- Osaka City Public Health Center, Southeast Living and Health Inspection Office, 1-2-7, Asahi-cho, Abeno-ku, Osaka 545-0051, Japan
| | - Yuki Hirai
- Division of Microbiology, Osaka Institute of Public Health, 8-34, Tojo-cho, Tennoji-ku, Osaka 543-0026, Japan
| | - Teruo Hirayama
- Division of Microbiology, Osaka Institute of Public Health, 8-34, Tojo-cho, Tennoji-ku, Osaka 543-0026, Japan
| | - Kaoru Goto
- Division of Microbiology, Osaka Institute of Public Health, 8-34, Tojo-cho, Tennoji-ku, Osaka 543-0026, Japan
| | - Atsushi Hase
- Division of Microbiology, Osaka Institute of Public Health, 8-34, Tojo-cho, Tennoji-ku, Osaka 543-0026, Japan
| | - Jun Ogasawara
- Division of Microbiology, Osaka Institute of Public Health, 8-34, Tojo-cho, Tennoji-ku, Osaka 543-0026, Japan
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