title: The risk of bronchiolitis hospitalisation following administration of a group B meningococcal vaccine in New Zealand.
abstract: OBJECTIVE
  During the Phase II clinical trials for a new group B meningococcal vaccine in New Zealand, six study participants (including five children who had been vaccinated with this vaccine) were hospitalised due to acute bronchiolitis. We examined more closely the potential association between bronchiolitis hospitalisation and this vaccine.
  
  
  METHODS
  We used descriptive comparisons, a cohort analysis, and a matched case-control study to examine the potential association of bronchiolitis hospitalisation with the vaccine using New Zealand Health Information Service hospital discharge data and vaccination data from the National Immunisation Register.
  
  
  RESULTS
  The distribution of hospitalised bronchiolitis cases throughout New Zealand immediately following the introduction of the vaccine was consistent with historical (pre-vaccine) patterns. Similarly, all point estimates for relative risk (cohort analysis) and odds ratio (case-control study) for assessing the potential association between bronchiolitis hospitalisation and the vaccine were less than 1.00.
  
  
  CONCLUSIONS
  We concluded that this vaccine is not associated with an increased risk of hospitalisation for bronchiolitis.
authors.affiliation: Department of Epidemiology, University of Washington, Seattle, Washington, USA. pstehrgreen@att.net
authors.forename: Paul
authors.initials: P
authors.lastname: Stehr-Green
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Galloway
authors.forename: Charlotte
authors.initials: C
authors.lastname: Kieft
authors.forename: Anne
authors.initials: A
authors.lastname: McNicholas
mesh_terms: D000208:Acute Disease; D001988:Bronchiolitis / Q000453:epidemiology* / Q000209:etiology; D016022:Case-Control Studies; D015331:Cohort Studies; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D007223:Infant; D022401:Meningococcal Vaccines / Q000009:adverse effects*; D038541:Neisseria meningitidis, Serogroup B; D009520:New Zealand / Q000453:epidemiology; D016017:Odds Ratio; D012306:Risk; D012621:Seasons
chemical_list: D022401:Meningococcal Vaccines