Two people are infected in an Auckland measles outbreak - and the public is being warned to be on the alert.

Auckland Regional Public Health Service (ARPHS) says an infant and a young adult have caught the highly-contagious infectious disease.

People who may have been exposed to measles in two public locations are urged to watch out for symptoms.

The adult was at an event at the Life Central Church in Normanby Road on the evening of Wed 6 March.

People at the Wesley market on the morning of Friday 8 March may have also been exposed as the infant was at the International Women's Day event there.

ARPHS says anyone at these locations at these times may come into contact with the airborne virus.

They need to watch for symptoms - a high fever, runny nose, cough and sore red eyes, followed by a rash starting around the head and spreading to the body.

"If you feel unwell, please call your medical practice first and tell them if you have these symptoms, or you may have been exposed to the illness. You could infect others in the waiting room if you just turn up," Dr William Rainger says.

"Measles is one of the most contagious airborne diseases, and is infectious before the rash appears. It is very easily transmitted from one person to another, possibly by being the same space where an infected person has been."

Many young people in the Auckland region are not fully immunised, and ARPHS is urging people to get up to date.

Newshub.