in the present study , the antimicrobial activities of sbtpc against 50 isolates each of 6 species ( staphylococcus aureus , klebsiella pneumoniae subsp . pneumoniae , branhamella catarrhalis , haemophilus influenzae , streptococcus pneumoniae and streptococcus pyogenes ) of bacteria freshly obtained from upper respiratory tract infections were examined in relation to their bacterial beta-lactamase producing abilities . beta-lactamase producing strains were identified using the acidometry disc method with benzylpenicillin ( pcg ) of cefazolin ( cez ) as a substrate , and their frequencies of appearance were calculated as follows : s. aureus 86 % ;
C0004611
bacteria
C0597979
beta-lactamase