Vaccine Preventable Diseases and Vaccination Coverage in Australia, 2003 to 2005

Vaccination coverage estimates from the ACIR 1996 to 2005

Disclaimer: This is the fourth report on vaccine preventable disease and vaccination coverage in Australia, and is produced by the National Centre for Immunisation Research and Surveillance of Vaccine Preventable Diseases and the Australian Institute of Health and Welfare on behalf of the Australian Government Department of Health and Ageing published as a supplement to the Communicable Diseases Intelligence journal Volume 31, June 2007.

Page last updated: 20 July 2007

The methodology for calculating cohort-based vaccination coverage from the ACIR was published with the first coverage estimates in 1998.5 Using this method, a cohort of children is defined by date of birth in three-month groups, the first cohort being born between 1 January 1996 and 31 March 1996.16 The vaccination status of each cohort is assessed at the three key milestones of 12 months, 24 months, and 72 months of age. Coverage is measured several months after the due date for completion of each milestone, to allow for delayed notification to the ACIR. To minimise duplicate records, the cohort includes only children enrolled with Medicare (approximately 99% of children).5 It is assumed that notification of receipt of a later vaccine dose implies receipt of earlier doses, even if no earlier vaccination is recorded (‘third dose assumption’).16 A child is now defined as ‘fully vaccinated’ at 12 months of age if he or she has received a third dose of DTPa and poliomyelitis vaccine (oral or inactivated), a second or third dose of Hib vaccine (PRP-OMP), and either a second or a third dose of Hep B vaccine, depending on the pathway taken on the schedule. ACIR coverage estimates (using the ‘assumption’) for the first vaccination milestone (the first three scheduled doses of DTPa, OPV and, recently, two or three doses of Hep B and two or three doses of Hib) have been reported in Communicable Diseases Intelligence since 1998.294 The coverage for MMR has been reported in Communicable Diseases Intelligence since 1998.294 Coverage for the third vaccination milestone at 72 months of age has been reported in Communicable Diseases Intelligence since 2002.295

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