title: A comparison of two pertussis epidemics in Auckland.
abstract: OBJECTIVE
  To determine if the addition of the 6 week dose of pertussis vaccine in 1984 was associated with any change in the hospitalisation rate for children with pertussis and the higher hospitalisation rates for Maori and Pacific Islander children with pertussis.
  
  
  METHODS
  
  
  
  METHODS
  Population based study of pertussis hospitalisations using a retrospective chart review of hospitalisation data for children during the 1991 epidemic, which was compared to previously published data from the 1982 epidemic.
  
  
  METHODS
  Princess Mary and Middlemore hospitals, Auckland.
  
  
  METHODS
  Children aged 0-14 years resident in metropolitan Auckland and hospitalised in Auckland during 1982 or 1991 with pertussis.
  
  
  METHODS
  Hospitalisation rates were calculated as number of children with a discharge diagnosis of pertussis per 1000 children aged 0-14 years based on 1981 and 1991 census data. 1982 data were converted to person-years as published report was for an 8 month period. Hospitalisation rates were compared as a relative risk (RR) of hospitalisation in 1991 versus 1982.
  
  
  RESULTS
  There were 84 cases during 8 months in 1982 and 66 cases in 1991. Rates of hospitalisation by ethnic group; in 1982 were 0.24 Other/European (OE), 1.98 Maori (M), 1.37 Pacific Islander (PI); and in 1991 were 0.22 OE, 0.51 M, 0.40 PI. Compared to 1982 the relative risk of hospitalisation in 1991 adjusted for ethnicity was 0.43 (CI 0.33, 0.58, p < 0.0001). Compared to 1982 there was a significant reduction in the hospitalisation rate in 1991 for M (RR = 0.26, CI 0.16, 0.43, p < 0.0001); and PI children (RR = 0.29, CI 0.16, 0.54, p < 0.0001); but not for OE children (RR = 0.91, 95% CI 0.57, 1.46, p = 0.70).
  
  
  CONCLUSIONS
  There was a significant reduction in the rate of hospitalisation for pertussis in 1991 compared to 1982. This reduction in hospitalisation rate was due to a reduction in rates for Maori and Pacific Islander children.
authors.affiliation: Department of Paediatrics, University of Auckland, School of Medicine.
authors.forename: C C
authors.initials: CC
authors.lastname: Grant
authors.forename: D
authors.initials: D
authors.lastname: Tan
authors.forename: A
authors.initials: A
authors.lastname: Pati
authors.forename: P
authors.initials: P
authors.lastname: Watson
authors.forename: D R
authors.initials: DR
authors.lastname: Lennon
authors.forename: R
authors.initials: R
authors.lastname: Scragg
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks; D006760:Hospitalization; D006801:Humans; D007223:Infant; D009520:New Zealand / Q000453:epidemiology; D010567:Pertussis Vaccine; D012189:Retrospective Studies; D044465:White People; D014917:Whooping Cough / Q000453:epidemiology* / Q000208:ethnology / Q000517:prevention & control
chemical_list: D010567:Pertussis Vaccine