A Samoan visitor to New Zealand has travelled in the South while infectious with measles, the Southern District Health board says.
The person was in New Zealand, including Queenstown, between October 31 and November 4.
In Queenstown, the infectious person was at the Queenstown Medical Centre, Queenstown Pharmacy and Queenstown Countdown on November 4
In the Arthurs Pass/Greymouth area they were on a bus from Arthurs Pass to Greymouth and at the Lake Matheson Motel on November 3.
They took the Tranzalpine train from Christchurch to Arthurs Pass on the same day.
The SDHB said the incident was the first measles case in the region for almost two weeks, and a reminder for people to keep on the lookout for symptoms, and make sure anyone younger than 18 years old was fully vaccinated with two MMR vaccinations.
Measles symptoms included a cough, runny nose, inflamed eyes, and fever followed a few days later by a rash.
Anyone who thought they might have been exposed to measles - including pregnant women, parents of young babies, immune compromised and unvaccinated people - should watch out for symptoms and isolate themselves immediately if they started to get sick.