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    Vaccine. 2009 Aug 21;27 Suppl 3:C22-4. Epub 2009 Jun 21.

    Serotype replacement in perspective.

    Source

    Pediatric Infectious Disease Unit, Soroka University Medical Center and the Faculty of Health Sciences, Ben-Gurion University of the Negev, P.O. Box 151, Beer-Sheva 84101, Israel. rdagan@bgu.ac.il

    Abstract

    An increase in the incidence of invasive pneumococcal disease (IPD) caused by non-vaccine serotypes (NVTs) (serotype replacement) has been observed since the introduction of the seven-valent pneumococcal conjugate vaccine (PCV7), primarily in the elderly, HIV-positive adults, and children with underlying medical conditions. In children aged <5 years, only a slight increase in replacement disease due to NVTs has been observed, but the relationship of changes in serotype carriage to replacement disease is not well understood. Predominant post-PCV7 NVTs include serotypes 15, 19A, and 33F, but the increasing antibiotic resistance of 19A is of particular concern in both vaccinated and unvaccinated populations.

    PMID:
    19545935
    [PubMed - indexed for MEDLINE]

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