State and territory governments across Australia are tightening border restrictions with Victoria after thousands of interstate travellers were potentially exposed to COVID-19 at Melbourne Airport. There are now 13 coronavirus cases linked to Melbourne’s Holiday Inn, with the state now entering a five-day snap lockdown. There are also new potential community infection sites across Melbourne. Of most concern to health authorities is the Brunetti cafe at Melbourne Airport. An infected staff member worked there on Tuesday – potentially spreading the virus to interstate travellers before they boarded their planes. All states and territorities except for New South Wales have now implemented tough border controls on those coming in from Victoria, while NSW is choosing to mimick Victoria’s hard lockdown for those coming across the border. However, each state is taking a slightly different approach to exactly how those rules are enforced – and at what date they commence.