Six new cases were also confirmed in Victoria while a cluster of sick and dead crested terns found in the state's southwest underwent further testing. It bumped the national tally up to 78 - including 58 in SA alone - with a further 49 suspected cases. "That location is of concern, because it is where waterbirds are also located," she told reporters in Adelaide. "It's the perfect mix for the virus to spread and do maximum damage," BirdLife Australia's Sean Dooley told AAP. Environment Minister Murray Watt warned of a "long, difficult journey" ahead, saying the virus's spread would be confronting and cause significant damage to Australian wildlife.