The resistance rates of the organism to antibiotics were as follows: penicillin 48.9% (MICB/1 mg/ml; intermediately resistant 31.9%, MIC 1.5 mg/ml 8.5%, and MIC!/2 mg/ml; highly resistant 8.5%), erythromycin 55.3%, clindamycin 11.7%, cotrimoxazole 41.5% and chloramphenicol 6.4%.