Mods put this on front page everyone should read:
Keeping the Coronavirus from Infecting Health-Care Workers
A Key point for everyone panicing:
Those of us who must go out into the world and have contact with people don’t have to panic if we find out that someone with the coronavirus has been in the same room or stood closer than we wanted for a moment. Transmission seems to occur primarily through sustained exposure in the absence of basic protection or through the lack of hand hygiene after contact with secretions.
Consider a couple of data points. Singapore so far appears not to have had a single recorded health-care-related transmission of the coronavirus, despite the hundreds of cases that its medical system has had to deal with. That includes
one case reported this week of a critically ill pneumonia patient who exposed forty-one health-care workers in the course of four days before being diagnosed with covid-19. These were high-risk exposures, including exposures during intubation and hands-on intensive care. Eighty-five per cent of the workers used only surgical masks. Yet, owing to proper hand hygiene, none became infected.