Victorian Premier Daniel Andrews has announced it will be mandatory for people living in locked down parts of the state to wear a face mask.
It will apply to those in the Melbourne metro and Mitchell Shire areas and will be required for everyone above the age of 12.
Anyone who doesn't follow the rules will cop a $200 fine when the rule comes into effect at 11:59pm on Wednesday night.
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It doesn't have to be a proper surgical face mask, as authorities say you can use a scarf or other type of face covering.
Chief Health Officer Brett Sutton. said: "That is in recognition that it's likely to work for all of those age groups. Below the age of 12, it's a consideration. We say not for toddlers - so not two years and below - but it's a consideration for all other children.
"But it is mandatory, really, from that high school age onwards."