I've seen many tech companies in the Boston area announce employees can (or must) work from home, since the governor of Massachusetts declared a state of emergency on Tuesday and encouraged such actions. All governors should do likewise.
Admittedly, the Biogen conference was... a bit of a fuck-up. But yes, all our universities are sending their kids home, white-collar workplaces are moving towards WFH policies, etc. I've been WFH since earlier this week myself, and I went shopping for food and soap with my wife Tuesday night.