Communicable diseases surveillance highlights for 1st quarter, 2004 (bloodborne diseases, gastrointestinal diseases, quarantiable diseases, vaccine preventable diseases, vectorborne diseases, other bacterial infections), and surveillance outcomes from several reporting series as follows: National Notifiable Diseases Surveillance System tables, 1 January to 31 March 2004; Laboratory Serology and Virology Reporting Scheme tables, 1 January to 31 March 2004; Australian Sentinel Practices Research Network, reporting period 1 January to 31 March 2004; Australian childhood immunisation coverage, 1 October to 31 December 2003 cohort, assessed as at 31 March 2004; Gonococcal surveillance, reporting period 1 January to 31 March 2004; Meningococcal surveillance, reporting period 1 January to 31 March 2004; Australian Paediatric Surveillance Unit (APSU), reporting period 1 July to 30 December 2003 (cumulation of year to date); HIV and AIDS surveillance, reporting period 1 October to 31 December 2003, assessed as at 31 March 2004; National Enteric Pathogens Surveillance System, reporting period 1 January to 31 March 2004.