title: Invasive pneumococcal disease in Victoria: a better measurement of the true incidence.
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.
authors.affiliation: Communicable Diseases Section, Rural and Regional Health and Aged Care Services Division, Department of Human Services, Melbourne, Victoria, Australia. hazelclothier@optusnet.com.au
authors.forename: H J
authors.initials: HJ
authors.lastname: Clothier
authors.forename: T
authors.initials: T
authors.lastname: Vu
authors.forename: V
authors.initials: V
authors.lastname: Sundararajan
authors.forename: R M
authors.initials: RM
authors.lastname: Andrews
authors.forename: M
authors.initials: M
authors.lastname: Counahan
authors.forename: G F
authors.initials: GF
authors.lastname: Tallis
authors.forename: S B
authors.initials: SB
authors.lastname: Lambert
mesh_terms: D000328:Adult; D000367:Age Factors; D018563:Disease Notification / Q000706:statistics & numerical data*; D006302:Health Services Research; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D011008:Pneumococcal Infections / Q000453:epidemiology*; D011159:Population Surveillance / Q000379:methods*; D014739:Victoria / Q000453:epidemiology