During the review period of this report there was one source of data about national vaccination coverage: the Australian Childhood Immunisation Register (ACIR). The ACIR commenced in January 1996 and is administered by Medicare Australia (formerly the Health Insurance Commission) for the Australian Government Department of Health and Ageing. The ACIR records details, as supplied by vaccination providers, about the vaccination status of children aged less than seven years. Vaccination coverage estimates derived from ACIR data have been reported in Communicable Diseases Intelligence since early 1998. A complete description of the method for calculating coverage estimates by age cohorts is given elsewhere.16 In this report, we have described trends in ACIR vaccination coverage estimates for all vaccines on the current childhood schedule except meningococcal C vaccine, pneumococcal vaccines and varicella vaccine.