Prevalence and Antibiotic Resistance of Shiga Toxin Producing Escherichia coli Isolated from Retail Meat Markets:The Case of Tai'an City
Shiga toxin-producing Escherichia coli(STEC)is a kind of foodbome pathogen with strong pathogenic ability,which produce one or two Shiga toxin and has become an important public health problem.In this paper,the meat products were collected from retail markets in Tai'an,Shandong province for investigation of the prevalence of STEC.The STEC strains were detected in 9(5.3％)out of 170 retail meat samples.The detection rates of supermarkets and farm product markets were 3.1％and 6.7％,respectively with no significant difference(P＞0.05).The serotypes and virulence genes of STEC 24 strains were examined using PCR.As a result,10 strains belonged to the serotype O26 and 2 strains to O45.The main virulence genes were detected to be stx1,hlyA(62.5％,15/24)and stx2(37.5％,9/24).The eaeA gene was not detected.The antibiotic resistance of 24 STEC strains was tested using the disk diffusion method.The drug testing of these STEC strains revealed resistance rate of 91.7％to midecamycin,37.5％to amoxicillin and ampicillin and susceptibility to cefoxitin and polymyxin.These results showed that STEC was found in retail meats in Tai'an and pork and beef products had great risk.Relevant authorities should strengthen STEC monitoring to prevent foodborne diseases and reduce potential health hazards.
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