Invasive pneumococcal disease in Victoria: A better measurement of the true incidence

Hazel J. Clothier*, T. Vu, V. Sundararajan, R. M. Andrews, M. Counahan, G. F. Tallis, S. B. Lambert

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Invasive pneumococcal disease (IPD) notifications are used to monitor IPD vaccination programmes. We conducted sequential deterministic data-linkage between IPD notifications and hospitalization data in Victoria, Australia, in order to determine whether all diagnosed cases were being reported. The proportion of each relevant hospital admission ICD-10-AM code that could be linked to notified cases was calculated. Total and age-specific annual rates were calculated and compared for notified and non-notified cases. Total incidence was estimated using data-linkage results and application of a two-source capture-recapture method. The first 2 years of IPD surveillance in Victoria missed at least one-sixth of laboratory-confirmed IPD cases. Estimated annual IPD rate increased from 9.0 to 10.7/100 000 and rose even higher, to 11.5/ 100 000, with age-specific rates possibly reaching 90.0/100 000 children aged <2 years, when using capture-recapture. Strategies to improve notification and coding of hospitalized cases of IPD are required.

Original languageEnglish
Pages (from-to)225-231
Number of pages7
JournalEpidemiology and Infection
Volume136
Issue number2
DOIs
Publication statusPublished - Feb 2008

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