Easter travel plans in Australia are in chaos following new Covid-19 cases in Queensland

The state's recorded four community cases, forcing them into a three-day lockdown from this evening.

South Australia's imposed a hard border closure, while other states are asking recent arrivals to isolate and get tested.

Australian correspondent Oliver Petersen says the country will be on high alert as results come back.

He says there are tens of thousands of Australians trying to get away and those plans are now on ice.