I think the best coronavirus authority is likely Li Wenliang, the 34 year-old doctor in Wuhan that first tried to warn of its contagiousness and later died of it.
He recommends wearing what medical professionals call "droplet protection" - mask, eye cover, gloves around everyone. He caught it from a patient that wasn't showing any symptoms at the time.
The best thing we can do is look at how Hong Kong, South Korea, Taiwan, and Japan have suppressed the numbers despite massive population density. Essentially everyone has been wearing masks, not touching things like handrails and elevator buttons, washing and sanitizing their hands, and HK still has under 100 cases without much spreading. They already knew what to do because SARS (related to Covid, btw) came through and killed a bunch of people.
I've seen far too many people being arrogant, like bravado is going to keep their elderly loved ones from dying. Makes me sad, but the ego always wants to run from death.