摘要：Immunisation coverage reporting using data from the Australian Childhood Immunisation Register is likely tounderestimate immunisation uptake. Since 1997, several initiatives have been introduced to improve bothimmunisation uptake and notification of immunisation encounters. These initiatives seemed likely to have changedprevious coverage estimates. Re-calculation of immunisation coverage estimates for the previously reportedcohorts was undertaken. This used current Australian Childhood Immunisation Register data - especially theimmunisation history form and the impact of catch-up immunisations - to evaluate delayed reporting. Previouscoverage estimates published in Communicable Diseases Intelligence were shown to be at least 2% to 4% belowestimates based on data now held by the Australian Childhood Immunisation Register, with greater differencesobserved in particular jurisdictions
