High prevalence of non-O157 Shiga toxin-producing Escherichia coli in beef cattle detected by combining four selective agars
Abstract Background Shiga toxin-producing Escherichia coli (STEC) are emerging foodborne pathogens that are public health concern. Cattle have been identified as the major STEC reservoir. In the present study, we investigated the prevalence and characteristics of STEC strains in beef cattle from a c...
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doaj-218c3edaf4a64a09b8e224d0e88c67022020-11-25T01:25:27ZengBMCBMC Microbiology1471-21802019-09-011911910.1186/s12866-019-1582-8High prevalence of non-O157 Shiga toxin-producing Escherichia coli in beef cattle detected by combining four selective agarsRuyue Fan0Kun Shao1Xi Yang2Xiangning Bai3Shanshan Fu4Hui Sun5Yanmei Xu6Hong Wang7Qun Li8Bin Hu9Ji Zhang10Yanwen Xiong11State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and PreventionShandong Center for Disease Control and PreventionState Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and PreventionState Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and PreventionState Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and PreventionState Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and PreventionState Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and PreventionZigong Center for Disease Control and PreventionZigong Center for Disease Control and PreventionShandong Center for Disease Control and PreventionmEpiLab, New Zealand Food Safety Science & Research Center, Institute of Veterinary, Animal and Biomedical Sciences, Massey UniversityState Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and PreventionAbstract Background Shiga toxin-producing Escherichia coli (STEC) are emerging foodborne pathogens that are public health concern. Cattle have been identified as the major STEC reservoir. In the present study, we investigated the prevalence and characteristics of STEC strains in beef cattle from a commercial farm in Sichuan province, China. Results Among 120 beef cattle fecal samples, stx genes were positive in 90% of samples, as assessed using TaqMan real-time PCR, and 87 (72.5%) samples were confirmed to yield at least one STEC isolate by culture using four selective agars, MacConkey, CHROMagar™ ECC, modified Rainbow® Agar O157, and CHROMagar™ STEC, from which 31, 32, 91, and 73 STEC strains were recovered, respectively. A total of 126 STEC isolates were selected and further characterized. Seventeen different O:H serotypes were identified, all of which belonged to the non-O157 serotypes. One stx 1 subtype (stx 1a) and three stx 2 subtypes (stx 2a, stx 2c, and stx 2d) were present among these isolates. The intimin encoding gene eae, and other adherence-associated genes (iha, saa, and paa) were present in 37, 125, 74, and 30 STEC isolates, respectively. Twenty-three isolates carried the virulence gene subA, and only one harbored both cnf1 and cnf2 genes. Three plasmid-origin virulence genes (ehxA, espP, and katP) were present in 111, 111, and 7 isolates, respectively. The 126 STEC isolates were divided into 49 pulsed-field gel electrophoresis (PFGE) patterns. Conclusions Our study showed that the joint use of the selective MacConkey and modified Rainbow® Agar O157 agars increased the recovery frequency of non-O157 STEC strains in animal feces, which could be applied to other samples and in regular STEC surveillance. Moreover, the results revealed high genetic diversity of non-O157 STEC strains in beef cattle, some of which might have the potential to cause human diseases.http://link.springer.com/article/10.1186/s12866-019-1582-8Shiga toxinEscherichia coliO157:H7Non-O157 STECBeef cattleCulture medium |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ruyue Fan Kun Shao Xi Yang Xiangning Bai Shanshan Fu Hui Sun Yanmei Xu Hong Wang Qun Li Bin Hu Ji Zhang Yanwen Xiong |
spellingShingle |
Ruyue Fan Kun Shao Xi Yang Xiangning Bai Shanshan Fu Hui Sun Yanmei Xu Hong Wang Qun Li Bin Hu Ji Zhang Yanwen Xiong High prevalence of non-O157 Shiga toxin-producing Escherichia coli in beef cattle detected by combining four selective agars BMC Microbiology Shiga toxin Escherichia coli O157:H7 Non-O157 STEC Beef cattle Culture medium |
author_facet |
Ruyue Fan Kun Shao Xi Yang Xiangning Bai Shanshan Fu Hui Sun Yanmei Xu Hong Wang Qun Li Bin Hu Ji Zhang Yanwen Xiong |
author_sort |
Ruyue Fan |
title |
High prevalence of non-O157 Shiga toxin-producing Escherichia coli in beef cattle detected by combining four selective agars |
title_short |
High prevalence of non-O157 Shiga toxin-producing Escherichia coli in beef cattle detected by combining four selective agars |
title_full |
High prevalence of non-O157 Shiga toxin-producing Escherichia coli in beef cattle detected by combining four selective agars |
title_fullStr |
High prevalence of non-O157 Shiga toxin-producing Escherichia coli in beef cattle detected by combining four selective agars |
title_full_unstemmed |
High prevalence of non-O157 Shiga toxin-producing Escherichia coli in beef cattle detected by combining four selective agars |
title_sort |
high prevalence of non-o157 shiga toxin-producing escherichia coli in beef cattle detected by combining four selective agars |
publisher |
BMC |
series |
BMC Microbiology |
issn |
1471-2180 |
publishDate |
2019-09-01 |
description |
Abstract Background Shiga toxin-producing Escherichia coli (STEC) are emerging foodborne pathogens that are public health concern. Cattle have been identified as the major STEC reservoir. In the present study, we investigated the prevalence and characteristics of STEC strains in beef cattle from a commercial farm in Sichuan province, China. Results Among 120 beef cattle fecal samples, stx genes were positive in 90% of samples, as assessed using TaqMan real-time PCR, and 87 (72.5%) samples were confirmed to yield at least one STEC isolate by culture using four selective agars, MacConkey, CHROMagar™ ECC, modified Rainbow® Agar O157, and CHROMagar™ STEC, from which 31, 32, 91, and 73 STEC strains were recovered, respectively. A total of 126 STEC isolates were selected and further characterized. Seventeen different O:H serotypes were identified, all of which belonged to the non-O157 serotypes. One stx 1 subtype (stx 1a) and three stx 2 subtypes (stx 2a, stx 2c, and stx 2d) were present among these isolates. The intimin encoding gene eae, and other adherence-associated genes (iha, saa, and paa) were present in 37, 125, 74, and 30 STEC isolates, respectively. Twenty-three isolates carried the virulence gene subA, and only one harbored both cnf1 and cnf2 genes. Three plasmid-origin virulence genes (ehxA, espP, and katP) were present in 111, 111, and 7 isolates, respectively. The 126 STEC isolates were divided into 49 pulsed-field gel electrophoresis (PFGE) patterns. Conclusions Our study showed that the joint use of the selective MacConkey and modified Rainbow® Agar O157 agars increased the recovery frequency of non-O157 STEC strains in animal feces, which could be applied to other samples and in regular STEC surveillance. Moreover, the results revealed high genetic diversity of non-O157 STEC strains in beef cattle, some of which might have the potential to cause human diseases. |
topic |
Shiga toxin Escherichia coli O157:H7 Non-O157 STEC Beef cattle Culture medium |
url |
http://link.springer.com/article/10.1186/s12866-019-1582-8 |
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