Objective To analyze the surveillance data of enterohemorrhagic Escherichia coli (EHEC) O157∶H7 from 2005 to 2018 in Anhui Province,and to understand the infection situation of EHEC O157∶H7 in human,poultry and livestock,and the carrier situation of food,water and vector insects. Methods From 2005 to 2018,monitoring points were set up in Wuhu City,Bengbu City and Xiaoxian County to collect diarrhea patients feces,host animals feces,vectors insects,food and other samples.O157∶H7 strain was isolated and cultured by enrichment,and virulence genes of the positive strain were determined by PCR. Results From 2005 to 2018,a total of 21966 samples were monitored and 123 strains of EHEC O157∶H7 were detected,with a total positive rate of 0.56%.Among them,the positive rate of host animal feces was the highest,which was 1.07% (97/9 082),the positive rate of vector insect samples was 0.93% (17/1 835),the positive rate of food and water samples was 0.24% (6/2 533),and feces were positive in 3 patients with diarrhea,the positive rate was 0.04% (3/8 516).123 strains of O157∶H7 were isolated from the positive samples.None of the positive strains detected by PCR from 2013 to 2018 carried virulence genes. Conclusion In Anhui Province,there were still scattered animals infected with EHEC O157∶H7 in the host animals,and there were human cases infected with O157∶H7 in Xiaoxian County.Monitoring and management of animal waste should continue to be strengthened.
Key words
Enterohemorrhagic Escherichia coli O157∶H7 /
Surveillance /
Host animals /
Emerging infectious diseases
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