title: Treatment failure in acute streptococcal tonsillitis in children over the age of 10 and in adults.
abstract: 13/169 outpatients (8%) with streptococcal tonsillitis developed a new tonsillitis with the same strain within 2 weeks of completion of therapy (clinical treatment failures) and 24 (14%) remained carriers (bacterial treatment failures) after treatment with phenoxymethylpenicillin (penicillin V) 12.5 mg/kg body weight twice daily for 10 days. The mean serum concentration 60 min after penicillin V administration was 7.84 micrograms/ml. Very large individual differences in serum concentration were found but these differences could not be correlated to treatment failure. About 60% of the patients showed salivary concentrations around 0.03 micrograms/ml. Three strains of streptococci (groups C and G) from patients with bacterial treatment failure had MIC values of 0.06 and 0.12 micrograms/ml. A majority of the patients with clinical treatment failures had contact with individuals with high carrier rates of beta-hemolytic streptococci. It therefore seems likely that some so-called treatment failures in reality are new infections. In clinical treatment failures group A streptococci were twice as common as groups C + G. In bacteriological treatment failures the ratio between A and C + G was 1:1. Patients with nonstreptococcal tonsillitis as well as carriers of groups C and G may appear among bacterial treatment failures.
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D002648:Child; D006801:Humans; D010349:Patient Compliance; D010404:Penicillin V / Q000008:administration & dosage / Q000032:analysis / Q000097:blood; D012008:Recurrence; D012463:Saliva / Q000032:analysis; D013290:Streptococcal Infections / Q000188:drug therapy / Q000635:transmission; D013291:Streptococcus / Q000302:isolation & purification; D014069:Tonsillitis / Q000188:drug therapy* / Q000209:etiology / Q000382:microbiology
chemical_list: D010404:Penicillin V