Classification: ICD-9 066.3; ICD-10 R50.9 (Barmah Forest) and B33.1 (Ross River)

Syndromes and synonyms: Polyarthritis and rash, epidemic polyarthritis, Barmah Forest virus disease, and Ross River virus disease, Murweh virus disease.

Agent: Barmah Forest virus (BFV) and Ross River virus (RRV), enveloped RNA viruses, genus Alphavirus in the family Togaviridae. An early isolate of BF from Queensland was initially named Murweh virus. There are two topotypes of Ross River virus, from eastern and western Australia; a third, in northeastern Australia, has not been found since the mid-1970s.

Reservoir: Large marsupials, particularly kangaroos and wallabies.

Vector: Mainly Ochlerotatus vigilax and Culex annulirostris. Aedes camptorhynchus, A. normanensis, A. notoscriptus, and Coquillettidia linealis are vectors in some circumstances.

Transmission: Mosquito bite; transovarial transmission has been demonstrated in Aedes vigilax. There is no direct person-to-person transmission.

Cycle

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