β-LACTAMASE PRODUCTION OF CLINICALLY ISOLATED BACTERIA

Abstract

We examined β-lactamase productions by clinically isolated strains of bacteria. The results were as follows;
1. It appears that β-lactamases produced by strains of five species of Staphylococcus spp. are mostly penicillinase (90%). Souce of β-lactamase producing strains of Haemophilus influenzae (23%) and all of Moraxella subgenus Branhamella catarrhalis: strins (100%) are “High & Low producer” strains.
2. A large proportion of β-lactamase producing strains of Enterobacteriaceae and Bacteroides fragilis group appeared to be “High producer”
3. β-lactamase producing abilities are different among glucose non-fermentative Gram-negative rods.
It appears that some of the strains appeared to be “High producers”.