Victoria is again on measles alert after two new cases were confirmed on Saturday, taking to 34 the number of infections recorded in the state this year.

News of the additional infections comes a day after a young Victorian woman who had been in Geelong, central Melbourne and bayside suburbs before boarding a Jetstar flight to Brisbane was diagnosed with the highly contagious disease.

Her travel movements have also put Queensland health authorities on alert.

On Saturday, Victorian health authorities expressed concern that the latest outbreak could mean multiple undetected cases could already exist within the community, adding to the potential for a "significant outbreak".