For years, as cases of the deadly H5 strain of bird influenza wreaked havoc among animal populations across the globe, Australia had been the sole continent to avoid it successfully — until now "There's no evidence of any mass mortalities, and there's no evidence that it's in our poultry or agriculture system at this stage," Collins added.In its efforts to tackle previous bird-flu outbreaks, Australia has tightened biosecurity measures at farms, tested shore birds for disease, vaccinated vulnerable species, and war-gamed response plans for an H5N1 outbreak.A single migratory wild seabird potentially infected with the disease was found in Western Australia on 14 June