Isolation, identification and drug sensitive test of pathogenic bactcria causing dairy cattle mastitis in Nanjing suburb

Dairy cattle mastitis was investigated in some farms of Nanjing suburb. Pathogenic bacteria were isolated and identified from the milk of cows suffered from clinical mastitis and then used for drug sensitive test. The results showed that incidence rate of clinical mastitis was 2.36% and average positive rates of latent mastitis in the individual and the quarter were 53.97% and 18.92%, respectively; The main pathogenic bacteria included Staphylococci, Streptococci and bacillus coli, all of which were hypersensitive to Ciprofloxacin, Norfloxacin and Ofloxacin.