An outbreak of laboratory confirmed measles involving 30 young adults and an infant is reported. After a trip to India, the primary case returned to Sydney early in January 2001 and then visited Melbourne infecting several individuals.
Secondary spread appears to have occurred at a nightclub.
On the basis of RNA typing the measles strain involved is of genotype 'D'. The previous measles outbreak in Victoria affected a similar age group. Measles-containing vaccines were first available in Australia in 1968. As with the 1999 outbreak, the hospitalisation rate among this group has been high. He visited Melbourne from 17 to 20 January 2001 during his infectious period.