It is transmitted by mosquitoes Culex annulirostris, Ae. camptorhynchus. Ae. polynesiensis and other Aedes spp. of mosquitoes. Incubation Period Usually three to 11 days. There is no evidence of transmission from person to person. Susceptibility and Resistance Recovery is universal and is followed by lasting immunity.
Second attacks are unknown.
Inapparent infections are common, especially in children, among whom the clinical disease is rare. Arthritis occurs more frequently among adult females and in persons with a particular HLA DR7 phenotype. Control of Case Not applicable. Control of Contacts Unreported or undiagnosed cases should be searched for in the region where the patient had been during the incubation period of their illness. All family members should be questioned about symptoms and evaluate serologically if appropriate.