People who visited gyms, swimming pools and restaurants in Melbourne last week have been urged to be on the look out for signs of measles.

A man in his 20s became infected after returning from Thailand earlier this month, before spending hours in the Noble Park Aquatic Centre and a number of Goodlife Health Clubs.

The infected man flew in to Melbourne from Bangkok this month.

The young man returned to Australia from Bangkok on May 4, but Victoria’s deputy chief health officer Dr Brett Sutton said he did not become infectious until later.

He may have been spreading the disease when he spent the day at the Noble Park Aquatic Centre, from 7am to 4pm, on Tuesday, Wednesday, Thursday and Friday last week.