Australian Deputy Chief Medical Officer Nick Coatsworth spoke on people wearing masks on buses, trans or trams. He said if you’re “a vulnerable person” then wearing a mask would be a “reasonable thing to do.” According to Business Insider, he said “healthy members of the community” don’t need to. The World Health Organization advises healthy people to wear masks where physical distancing is difficult. “Asymptomatic transmission” is also a possibility and a reason why people who seem healthy should wear a mask.