Health officials are urging travellers to south-east Asia to be vaccinated against measles as an outbreak is declared in Far North Queensland.

Further cases of measles are expected in Cairns.

The city's latest confirmed case of measles is a close contact of someone who was diagnosed after arriving in Far North Queensland from Bali.

Cairns Public Health Unit director Jacqueline Murdoch said there would be a "couple of hundred" close contacts.

"This case was an unvaccinated contact of our case from last week and we do expect further cases in this outbreak," she said.

The latest case of measles is the fourth in Cairns this year.

The first three were all confirmed to have measles after arriving from Bali.

"There's a number of measles outbreaks at the moment in south-east Asia, including

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