While Tasmania has gone 100 days without a Covid-19 case, it is warned that now is not the time to get complacent.
As South Australia deals with a coronavirus cluster, there are concerns surrounding South Australians who have already entered the state.
Tasmania's Premier Peter Gutwein says South Australians looking to head to Tasmania shouldn't come.
He's confirmed around 1200 South Australians here need to stay inside, unless they're leaving the state.
"If you're in the state at the moment and arrived from the 7th of November, and you're from South Australia, remain self-isolating until you have been in the state for 14 days, and you are symptom free."
"If you want to return home, wear a mask and you can leave the state and head back to South Australia, or another jurisdiction."
A strict six-day coronavirus lockdown is now in effect across South Australia.
Residents have to stay at home, unless they are essential workers, schools are closed, takeaway outlets shut and outdoor exercise and sport banned.
The Covid-19 cluster in the city has grown to 22, with seven more suspected cases likely to be added.
SA Premier Steven Marshall says the circuit-breaker will buy the state time.
"Time is of the essence, and we must act quickly and decisively. We cannot wait to see how bad this becomes."
"We must act of the health advice to stay ahead of the game."