From October, 1974 to May 1977, we have done bacteriological culture and sensitivity test by aspirating pus from 33 cases of peritonsillar abscess patient. Following result was obtained : 1) Male to female ratio was 18 to 15. 2) Most frequent age group was between 21~30, 12 cases in number (36.4%), next group was between 11~20, 8 cases (24.2%), and then between 31~40, 5 cases (15.2%). 3) Bacteriological culture showed, 8 cases (24.2%) of β-hemolytic streptococcus & γ-hemolytic streptococcus each, 5 cases (15.1%) of α-hemolytic streptococcus and 7 cases (21.2%) of no growth. 4) Bacteriological sensitivity test showed that α, β & γ-hemolytic streptococci were sensitive to ampicillin, gentamycin, ceporan, erythromycin, kanamycin, geopen, pencillin, streptomycin terramycin, minocin & chloramphenicol and few cases were resistant. But coliform bacillus, yeast like fungus & pseudomonas were resistant to ampicillin, ceporan, kanamycin, geopen, penicillin, streptomycin, terramycin minocin & chloramphenicol.