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296 specimens of oral pyogenic infections were selected during the period between 1986 and 1987 for this study. Strins isolated from those specimens were classified as follows . 161 strains (54.4%) as Streptococcus spp., 110 strains (372%) as bacteroides, 92 strains (3L1%) as Staphylococcus, 56 strains (18.9%) as coliforms, 27 strains (9.1%) as Anaerobic Gram-positive coca, 14 strains (4.7%) as Anaerobic Gram-negative rods, and 10 strains (3.8%) as Fusobacterium spp. Among the total 92 isolates of Staphylococcus spp., 84 strains were identified as Streptococcus aureus, and their susceptibilities to 9 common antibiotics was determined by agar dilution method. All strains were resistant to two or more durgs. The resistance found most commonly were to tetracyclin (TC, 892%) and to penicillin (PC, 892%), Kanamycin (KM, 79.8%), chloramphenicol(CP, 72.6%), ampicillin(AP, 702%), gentamycin (GM, 55.95%), erythromycin GEM, 32.1%), amikacin (AK, 17.9%) and streptomycin (SK 15.5%), in order. The kinds of resistance patterns were 42. The resistance to TC PC KM CP GM AP EM was most common and followed by TC PC KM AP.
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