While it's always good to have publicity about mosquito borne diseases, the article isn't particularly accurate according to the National Notifiable Diseases Surveillance System, which shows relatively lower numbers of infections reported nationally and for Victoria last year.
http://www9.health.gov.au/cda/source/rpt_4.cfm
Regardless, mosquitos in all parts of Australia can transmit debilitating diseases and we should always be cautious. Thousands of Australians suffer new infections every year.