Legionnaires scare linked to Melbourne spa

Health authorities have issued a warning after a Legionnaires' disease outbreak which may be linked to a spa at a Melbourne gym.

Two people were hospitalised after using the spa at the Core24 gym in Frankston, in the city's southeast, the Department of Health and Human Services said on Saturday.

Anyone who may have used the spa should be on the lookout for possible symptoms, which include headache, fever, chills and muscle aches and pains followed by respiratory problems and pneumonia.

"People who have been exposed to the potential source could still develop symptoms over the next 10 days," Deputy Chief Health Officer Dr Brett Sutton said in a statement.

There are between 70 to 80 cases of Legionnaires' disease in Victoria each year.