[1][8] The virus has gradually spread from the sub-tropical northern areas of Victoria to the coastal regions of New South Wales, Queensland and Western Australia (WA).

Fever and malaise generally disappear within a few days to a week, but other symptoms such as joint pain may continue for six months or longer.

[8][10] Most people may recover within a few weeks, but the minority can continue to have the symptoms for many months, and in the most severe cases, up to a year.

[12] The Barmah Forest virus is diagnosed by examination of blood serum collected from potentially infected people.

[citation needed] During the years of 1995–2008, 15592 cases of Barmah Forest virus were recorded in Australia.

[16] The type of mosquito that transmits the virus can alter: the best way to ascertain an area is affected is by contact with local Health Officers.