Abstract:The Streptococci was symatically identified in 170 mastitis milks from two areas (northeastern and northeastern) of China, with the aim to understand the present situation of mastitis caused by Streptococci in chinese cow. The drug suceptibility of isolated Streptococci strains against 29 commonly used antibiotics was compared. The results showed that 18 and 11 strains of Streptococcus were isolated from the northeastern and western areas, respectively, and there were differences in drug suceptibility between the northeastern and the western region. All the isolated Streptococci strains showed a drug resistance against 29 kinds of drugs, but to a varying extent. Streptococcus in northeastern region showed a high drug resistance against trimethoprim(90.0%), sulfonamides(80.0%), oxacillin(78.5%), lincomycin(74.6%), clindamycin(66.9%)and cefoxitin (62.3%), while Streptococcus in western region showed a high drug resistance against trimethoprim(90.9%), oxacillin(81.8%), penicillin Gand sulfamethoxazole(72.7%). All the isolated isolated Streptococci strains in both the regions showed multiple drug resistance to antibiotics.
