Study on Antibiotics Resistance of Escherichia coli in Milk Samples from Cows with Mastitis in North China
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Abstract:
In order to investigate the drug resistance of E. coli in the breast milk samples in North China, 240 batches of mastitis milk samples from North China were collected. E. coli was isolated and identified by EMB medium and bacterial suspension method. Susceptibility tests were performed on eight commonly used antibiotics. The results showed that 17 strains (7.08%) of Escherichia coli were isolated. The results of drug susceptibility tests showed that isolated strains of E. coli showed high resistance and multi-drug resistance. The isolated strains were resistant to 4 antibiotics at least, with the most resistant 19 species, and more than 5 resistant strains (58.82%). For single antibiotics, the resistance rate to penicillin, oxacillin, and lincomycin of isolated strains was 100%. For different types of antibiotics, the resistance rates of isolated strains of E. coli to β-lactams and lincosamides were 55.15% and 61.76%, respectively. The objective of this work was to find out the drug resistance of E. coli in milk samples from mastitis. It was helpful to prevent and control cow mastitis according to the data and reduce the residue of veterinary drugs in milk, which would improve the quality of milk.
