1Delsol A A,Halfhide D E,Bagnall M C,et al.Persistence of a wild type Eseheriehia coli and its multiple antibiotic-resistant(MAR) derivatives in the abattoir and on chilled pig earcasses[J] .Int J Food Mierobiol,2010,140(2-3):249-253.
2Zhang X Y,Ding L J,Yue J.Occurrence and characteristics of class 1 and class 2 integrons in resistant Eseheriehia coli isolates from animals and farm workers in northeastern China[J] .Microbial drug resistance,2009,15(4):323-328.