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Antimicrobial Agents and Chemotherapy, April 2008, p. 1551-1552, Vol. 52, No. 4
0066-4804/08/$08.00+0 doi:10.1128/AAC.01580-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Vaccine Preventable Bacterial Diseases, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
Received 7 December 2007/ Returned for modification 11 January 2008/ Accepted 17 January 2008
Canadian invasive Haemophilus influenzae isolates from 1990 to 2006 were examined for antibiotic susceptibility: 42 strains (17.8%) were resistant to ampicillin by β-lactamase production, 5.5% were β-lactamase negative ampicillin intermediate, and 2.5% were intermediate to only the 2-µg ampicillin disk. An increase in β-lactamase-negative ampicillin-intermediate strains has been found.
Published ahead of print on 28 January 2008.
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