Queenslanders have been warned about the dangers of measles and overseas travel after more than half of the 12 cases already diagnosed this year were linked to overseas trips.

Health officials say people born after 1965 - especially those planning overseas travel - should have two doses of the measles vaccine to ensure they're fully protected.

"Every year we see cases of measles in people who acquire the infection overseas and then spread it while they're in Queensland," Dr Jonathan Malo of the communicable diseases branch said on Monday.