PEDIATRICS Vol. 72 No. 4 October 1983, pp. 464-468
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Ampicillin-Resistant Haemophilus in the Oropharynx: Prevalence in Three Groups of Young, Middle-Class Children

Richard H. Schwartz MD1, William J. Rodriguez MD, PhD1, and Coleen Bryan MT1

1 From the Research Foundation, Microbiology Research, Children's Hospital National Medical Center, and Department of Child Health and Development, George Washington Medical School, Washington, DC

Infections caused by ampicillin-resistant Haemophilus influenzae type b are prevalent in Fairfax County, VA. In order to gain information on pharyngeal carriage of ampicillin-resistant H influenzae, oropharyngeal cultures were obtained from 249 young children. The study population comprised three groups: 90 healthy children (group A), 79 children who had finished a ten-day course of amoxicillin treatment for acute otitis media (group B), and 80 children who were brought to our office for treatment of purulent nasopharyngitis (group C). Approximately 60% of the children in each group carried Haemophilus in the oropharynx. H parainfluenzae was the predominant oropharyngeal species in group 1. H influenzae was predominant in the other two groups. Ampicillin-resistant Haemophilus sp organisms were recovered from 16% of children in group A, 25% of those in group B, and 17% of patients in group C. Recent exposure to ampicillin was associated with an increase in the recovery of ampicillin-resistant strains of Haemophilus.

Key Words: Haemophilus influenzae • ampicillin • oropharyngeal carriage

Submitted on November 23, 1982
Accepted on January 31, 1983




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M. I. Marks
Haemophilus influenzae Infections: The Impact of Resistance on the Use of Aminopenicillins and Other Antimicrobials in Outpatient Therapy
Clinical Pediatrics, October 1, 1984; 23(10): 535 - 541.
[Abstract] [PDF]