Why are face masks compulsory in Melbourne?

Wearing masks will be made compulsory for people out in public in coronavirus-hit Melbourne and the adjacent Mitchell Shire from 11:59pm on Wednesday (22/07). Why do you need to wear a mask?Who doesn't need to wear a mask? What should I wear? Will a scarf do? What's the penalty for not covering your face? Here's what we know about the new rules and masks. Praba Maheswaran presents a segment speaking to Balamuraleekrishna, Clement who are living in Melbourne and Respiratory & Sleep Specialist (John Hunter Hospital), Lecturer (University of Newcastle) Dr Shyamala Pradeepan.