1. Introduction
During the past decade, outbreaks of food-borne illnesses
associated with the consumption of contaminated food produce
continue to be a public health problem. Fresh produce can be
contaminated with various human pathogens including bacteria,
protozoa and viruses. Among the bacterial pathogens, numerous
outbreaks are caused by Escherichia coli O157:H7 (E. coli O157:H7),
which is dangerous because of its low infective dose (as few as
10 cells), high pathogenicity and ability to survive under frozen
conditions [1]. Moreover, the virulence genes were found to be
transferable to non-pathogenic E. coli strains [2]. In China, the
first E. coli O157:H7 strain was isolated from hemorrhagic coliti
1. IntroductionDuring the past decade, outbreaks of food-borne illnessesassociated with the consumption of contaminated food producecontinue to be a public health problem. Fresh produce can becontaminated with various human pathogens including bacteria,protozoa and viruses. Among the bacterial pathogens, numerousoutbreaks are caused by Escherichia coli O157:H7 (E. coli O157:H7),which is dangerous because of its low infective dose (as few as10 cells), high pathogenicity and ability to survive under frozenconditions [1]. Moreover, the virulence genes were found to betransferable to non-pathogenic E. coli strains [2]. In China, thefirst E. coli O157:H7 strain was isolated from hemorrhagic coliti
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