There was a widespread Australian Encephalitis outbreak in the "Top End" of the Northern Territory this year following near record rainfall and a general rise in mosquitoes numbers. At least five cases of Australian Encephalitis due to Murray Valley Encephalitis virus were recorded, with additional suspect cases due to Kunjin virus. The branch responded with mosquito vector investigations at the various places of infection and the organization of mosquito control in risk communities and a Northern Territory wide public awareness program.