"The health battle is the battle that all Australians are enlisted in as we fight this virus." Prime Minister Scott Morrison, 22 March The Prime Minister has effectively placed Australia on a war footing to fight the coronavirus pandemic. For some, the realisation of the deadly danger posed by COVID 19 is only now sinking in. Others have been sounding the alarm for weeks. On Monday, Four Corners investigates how coronavirus spread to Australia, laying the groundwork for the crisis that is now unfolding.