SYDNEY, June 24 — Australian authorities ramped up surveillance and testing after a second state reported a case of the highly pathogenic H5N1 bird flu, while neighbouring...

Testing is still under way on a second bird after Australia's first case of the deadly H5 bird flu was confirmed on WA's south coast.

The H5N1 strain has been confirmed in a northern giant petrel, near where the virus was first detected in Western Australia.

Australia is facing a new biosecurity challenge after the detection of the highly pathogenic H5 bird flu strain in migratory seabirds. The discovery ends years of Australia being…