People across three states are being warned to be on high alert for measles symptoms after three people visited several locations over multiple days while infectious.
Plane and bus passengers have potentially been exposed to measles after a returned international traveller flew into Sydney's International Airport and travelled to the ACT by bus.
The infectious person flew into Sydney Airport from Dehli on Air India flight AI 302 on Saturday at 8.10pm before transiting through the terminal 1 international arrivals hall where they stopped at baggage claim and customs.