Premier Steven Marshall said the situation was dangerous and time was of the essence in dealing with the outbreak which currently stands at 17 cases.

"It's hard, it's early. But I hope to have these in place for as short a time as possible," he said on Monday.

"If we act quickly and decisively I'm hopeful we can get this under control in the coming weeks."

Among the mandated changes to take effect from midnight on Monday, gyms, recreation centres and play cafes will close for two weeks with community sports fixtures and training cancelled.

Funerals and family gatherings will be capped at 50 people, and all church gatherings at 100 people.

Pubs, clubs and restaurants will be limited to 100 people along with all other public gatherings.

All venues or functions must abide by a rule of one person to each four square metres.

Masks will be mandatory for workers in personal care businesses and for workers in aged care if physical distancing is not possible.

Aged care workers will be limited to just one site but schools will remain open.

The government has also issued a range of advice measures including urging people to work from home where possible, encouraging vulnerable people to stay home, and the wearing of masks if physical distancing is a problem.

Police Commissioner Grant Stevens said it was hoped all the measures would be only needed for two weeks.

But he said that depended on how well the new outbreak was contained.

"If we see a continuing spread of this particular cluster then we'll have to take other action," he said.

"This is a wake-up call for us."

Australian Associated Press