fifty patients , scheduled for an elective tonsillectomy because of recurrent group a beta-hemolytic streptococcal tonsillitis , participated in a prospective randomized study that compared the efficacy of presurgical treatment with either phenoxymethyl penicillin or clindamycin hydrochloride in eradicating group a beta-hemolytic streptococci and beta-lactamase-producing bacteria ( blpb ) from the tonsillar core .
C0597979
beta-lactamase
C0004611
bacteria