Suppurative Samples from 52 CSOM patients were analysed for its e.tiological elements with the methods of aerobic culture

L-phase-bacteria culture and anaerobic culture

the detective rates of which were 76.9%

76.9% and 23% respectively. There was no significant relationship between the detective rates and clinical types of CSOM. The detective rate of mixed infection was 69%

and simple infection 60.5%

which was significantly lower than those of caries and cholesteatoma

92.7% (P<0.05). The author suggested that infection with L-phase-bacteria

ana-erobia

or mixed infection is one of factors for protracted course of this disease. Based on the data of drug-sensitivity test

the author suggested that a combined antibiotics of administration might be a useful way for treatment