A 37-year-old man airlifted to Hervey Bay Hospital from Fraser Island was given a preliminary diagnosis of Ross River Fever by the attending RACQ CareFlight doctor.
An RACQ CareFlight spokeswoman said the preliminary diagnosis was given at the scene on Wednesday afternoon.
While a confirmation of the man's diagnosis will be provided once his blood test results are analysed, a Hervey Bay Hospital spokesman said his condition was "undergoing further investigations".
Ross River Fever or virus is spread by a number of species of mosquito including the Culex annulirostris, the Aedes vigilax and the Aedes notoscriptus.
Most people become unwell within three to 11 days after being bitten by an infectious mosquito.
Symptoms can include inflammation and pain in multiple joints, swelling and a rash on the torso which may be accompanied by a fever.
A 37-YEAR-OLD man airlifted from Fraser Island to Hervey Bay Hospital after falling ill from a suspected mosquito-borne disease is in a stable condition.
A Bundaberg RACQ CareFlight helicopter was dispatched at about 1pm on Wednesday to pick the man up from Orchid Beach on the western side of Fraser Is.
An RACQ CareFlight spokeswoman said the man was sailing on a catamaran when he began to feel sick.
"The helicopter landed at Orchid Beach to retrieve the man and fly him to Hervey Bay Hospital for further treatment," she said.
"He travelled in a stable condition."
A confirmation of the man's diagnosis will be provided on Thursday following analysis of the man's blood test, a Hervey Bay Hospital spokesman said.
Earlier this month it was reported by the Chronicle that 67 laboratory-confirmed notifications of Ross River virus infection and 15 of Barmah Forest virus infection were made to the Wide Bay Public Health Unit last year.
While Wide Bay Hospital and Health Service public health physician Dr Margaret Young said notifications for both mosquito-borne diseases were "presently low", she advised residents to prevent mosquito bites where possible.
Fraser Coast health professionals are now on alert for the mosquito spread Zika virus.