Ross River Virus

Close up view of a person reading label on insect repellent

Ross River virus is spread through the bite of an infected mosquito. Rarely, Ross River virus has spread from mother to baby during pregnancy and through a blood transfusion.

Ross River virus belongs to a group of viruses called alphaviruses. Most cases of Ross River virus disease occur in Australia and Papua New Guinea. Cases have also been identified previously in many south Pacific islands including Fiji, American Samoa, New Caledonia, and the Cook Islands.