Concentration of anti-streptolyzin-O (ASL-O) blood serum in the patients with peritonsillar abscess was investigated. The high level of ASL-O takes place in the cases of tonsillitis, associated with S.pyogenes. The detection of elevated level of ASL-O in patients with chronic tonsillitis has played an important role in the timely identification of risk for complications from the internal organs. The article analyzes changes increasing frequency of concentration of ASL-O, depending on age and sex. The increasing concentration of ASL-O from 200 MU/ml to 926 MU/ml took place in 50 from 152 (32,9 %) patients. Males prevailed (70%) among these patients. The increasing concentration of ASL-O in the patients with peritonsillar abscess (as complication of chronic tonsillitis) is more frequent in the group of age before 30 (72,0 %). There is no correlation between the increasing concentration of ASL-O and leucocytosis in common blood analysis.
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