Isolation,Identification and Drug Sensitive Test of Pathogenic Bactcria Causing Dairy Cattle Mastitis

To study the the species and distributing of the main pathogenic bacteria causing dairy cow mastitis in different regions of China,identify the susceptivity to antibiotic of mail pathogens,and to provide a theorical foundation for comprehensive prevention and control of dairy cow mastitis.472 milk samples from cows suffered from clinical or subclinical mastitis were collected from cattle farm in Inner Mongolia,Gansu,Sichuan and Shanghai,and the main pathogens were identified and then used for drug sensitive test.The results showed that 482 strains of bacteria were isolated from the milk samples,149 strains among them are Staphlococcus aureus(30.91 %),91 are Staphylococcus epidermidis(18.88%),60 are Streptococcus agalactiae(12.45%),60 are Streptococcus dysgalactiae(12.45%),35 are Streptococcus uberis(7.26%),33 are E.coli(6.85%).The main pathogenic bacteria of each area is dissimilar,most of which were hyper sensitive to Ciprofloxacin,Levofloxacin,Ofloxacin,Cefazolin,but were completely not sensitive to Benzylpenicillin,Erythromycin and Vancomycin.