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Australia has confirmed its first mainland case of H5N1 bird flu after a migratory seabird tested positive in Western Australia, marking the arrival of the deadly virus on the last continent that had remained free of it. Australia's long-held status as the only continent free of H5N1 bird flu has ended. The country's agriculture ministry confirmed on June 20 that a migratory seabird found on a remote beach near Esperance in Western Australia had tested positive for the highly contagious strain. The infected bird, a brown skua, was discovered at Cape Le Grand National Park, approximately 700 kilometres southeast of Perth. A second bird, a giant petrel found in the same area, has also tested positive and is awaiting confirmation. Agriculture Minister Julie Collins described the detection as "sobering but not unexpected." "We all knew we couldn't be bird flu-free forever," she said. Prime Minister Anthony Albanese called the development "concerning" and said the government would do "whatever we can to restrict any spread." The government has invested $113 million in preparedness measures, including tightened biosecurity at farms, testing shorebirds, and vaccination of vulner...