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Irish Child Health Database - Peer Reviewed Papers

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You are here: Irish Child Health Database » Study Papers » Descriptive Studies - With a comparative dimension: time, geography, treatment, procedures » Epidemiology - descriptive, incidence, prevalence and/or trends
  • Penicillin susceptibility and epidemiological typing of invasive pneumococcal isolates in the Republic of Ireland

    Published in:

    Journal of Clinical Microbiology, Vol: 41, Page: 3641-3648

    Publication Date:

    2003

    Aims & Objectives:

    The aim of this study was to examine the incidence of invasive pneumococcal disease in the Republic of Ireland and to examine the associated isolates

    Abstract:

    A national study was undertaken to investigate the incidence of invasive pneumococcal disease in the Republic of Ireland and to examine the associated isolates. In 1999, 144 S. pneumoniae isolates, all recovered from cases of invasive disease, were received from 12 microbiology laboratories. The incidence of invasive pneumococcal disease was estimated to be 6.6/100,000 population. All isolates were analyzed for serotype, penicillin susceptibility, chromosomal relatedness (by using pulsed-field gel electrophoresis [PFGE]), and penicillin-binding protein (pbp) fingerprinting. Several findings of note were observed regarding the pneumococcal population in Ireland. First, isolates of 25 different serotypes were represented, with serotypes 14, 9V, 8, 5, 4, and 3 being the most common. This finding, together with the pbp fingerprinting and PFGE typing results, indicated the clonal spread of strains of these serotypes in Ireland. Second, 27 (18.7%) isolates had reduced susceptibility to penicillin, and 74% of these were serotype 9V. Of these, 80% appeared to belong to the same clone. This could suggest the spread of the international Spanish/French 9V penicillin-resistant clone into Ireland. Third, nine different pbp genotypes were identified, four of which were new. Two pbp genotypes accounted for the majority of isolates dividing them according to their penicillin susceptibility status but irrespective of serotype and PFGE type. This is strong evidence for the occurrence of horizontal transfer of pbp genes between strains, observed with both penicillin-susceptible and penicillin-nonsusceptible isolates. Fourth, there was evidence of serotype transformation since isolates, indistinguishable bypbp fingerprinting and PFGE typing, expressed different capsular types.

    Authors:

    D. Bennett; B. Lennon; H. Humphreys; M. Cafferkey

    Study Type:

    Study Papers » Epidemiology - descriptive, incidence, prevalence and/or trends » Descriptive Studies - With a comparative dimension: time, geography, treatment, procedures

    Categories:

    invasive pneumococca

    International Classification:

    Bacterium - Invasive pneumococca

    Keywords:


    Geography:

    Republic of Ireland (Republic of Ireland)