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J Clin Microbiol. 1984 July; 20(1): 131-132

Simple screening method for beta-lactamase-positive and -negative ampicillin-resistant Haemophilus influenzae isolates.

T R Parr Jr, C H Pai and L E Bryan

ABSTRACT

A simple, inexpensive method for screening for beta-lactamase-positive and beta-lactamase-negative ampicillin-resistant Haemophilus influenzae isolates was developed. Disks containing 10 micrograms of cloxacillin yielded no zone of inhibition when placed on chocolate agar plates inoculated with beta-lactamase-positive (16 strains) or ampicillin-resistant (greater than or equal to 1 microgram/ml) beta-lactamase-negative (10 strains) H. influenzae, whereas ampicillin-susceptible (less than or equal to 0.5 microgram/ml; 36 strains) H. influenzae almost always (92%) showed a zone of inhibition.

J Clin Microbiol. 1984 July; 20(1): 131-132






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Antimicrob. Agents Chemother. Clin. Microbiol. Rev.
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