Firefighters from the Western and Eastern Bay of Plenty as well as the Thames/Coromandel area should be on high alert after a confirmed case of measles.

The Auckland Regional Public Health Service has confirmed that a person who attended the SkyTower Firefighters Stair Challenge earlier this month had the infection.

Firefighters from the Bay of Plenty and the Thames/Coromandel area who took part in the SkyTower Stair Challenge are being warned to place themselves in isolation if they feel unwell or think they might have measles. Photo: File.

The man took part in the challenge and stayed at the Sky City Hotel, where he visited a local restaurant and other facilities within the complex.

Anyone who attended the following locations on the dates listed might be at risk of developing measles if they are not immune:

Sky City Hotel between May 22-24.

The Sky City Complex between May 22-24.

The Sky Tower Firefighter Stair Challenge event at the Sky Tower on May 23.

The Mexican Cafe on May 22.

The Auckland Regional Public Health Service says anyone who visited these locations and is not sure if they are immune should check with their general practitioner.

Anyone who was at the locations listed who is not immune or is unsure, should isolate themselves at home from today until Sunday, June 7, says the ARPHS.

If they become unwell they should call their GP or Healthline. It is vitally important to call first because measles is a highly infectious disease.

'You can catch it just by being in the same room as someone with measles,” says Dr Richard Hoskins, Medical Officer of Health.

'It is spread through the air, and someone with measles could easily infect others in a doctor's waiting room.”

The initial symptoms of measles include a fever, runny nose, cough and sore eyes. After around four days, a raised red rash spreads over the body, which can last for several days.

'The infected person had contact with a large number of people in Auckland while infectious,” adds Richard.

'Members of the public are urged to be extra cautious. 'It usually takes 10-14 days for someone who has caught measles to start showing symptoms. If anyone has been infected at the locations listed, they may start to develop symptoms from as soon as this weekend.”

The only way to avoid catching measles is to have had two measles vaccinations at least four weeks apart.

Children are routinely vaccinated against measles at 15 months and four years.

Anyone who has had measles is considered immune, which applies to everyone born before 1969.

Anyone born in 1969 or later who has not had measles or two doses of the measles vaccine is at risk of catching the disease.