PMID: 15361721Sep 14, 2004Paper

Community-wide vaccination with the heptavalent pneumococcal conjugate significantly alters the microbiology of acute otitis media

The Pediatric Infectious Disease Journal
Stan L BlockEileen Keegan

Abstract

Community-wide use of conjugated heptavalent pneumococcal vaccine (PCV7) in children <2 years of age could affect the microbiology of acute otitis media (AOM) in vaccinees, particularly for penicillin-nonsusceptible Streptococcus pneumoniae (PNSP). Since Summer 2000, 94% of young children cared for by this 7-clinician, pediatric practice in rural central Kentucky received 3 or 4 doses of PCV7 in the first 18 months of life. To determine changes in microbiology of AOM before and after community-wide routine implementation of PCV7. Among children 7-24 months old with severe or refractory AOM, we compared 336 AOM isolates from 1992-1998 with 83 AOM isolates from 2000-2003 in children who had received 3 or 4 doses of PCV7. Comparing each cohort (1992-1998 versus 2000-2003), the proportion of S. pneumoniae decreased from 48% to 31% (P = 0.009; relative risk, 0.754; 95% confidence interval, 0.628-0.906), and nontypable Haemophilus influenzae increased from 41% to 56% (P = 0.01; relative risk, 1.87; 95% confidence interval, 1.15-3.04; beta-lactamase-positive, 56% versus 64%, not significant). The proportions of intermediate PNSP and resistant PNSP, respectively, were 16% and 9% versus 13% and 6% pre- and post-PCV7, respectively. Vacci...Continue Reading

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