This seems to be the most sensible advice I have read so far:

www.theguardian.com/commentisfree/2020/mar/15/epidemiologist-britain-herd-immunity-coronavirus-covid-19

To summarise

" The UK should not be trying to create herd immunity, that will take care of itself. Policy should be directed at slowing the outbreak to a (more) manageable rate. What this looks like is strong social distancing. Anyone who can work from home, should. People who do not yet work from home should be encouraged to do so. Employers should guarantee sick pay, including for contacts of known cases, and do everything they can to discourage the practice of “presenteeism”. You should not shake hands. Not with anyone. You should wash your hands for 20 seconds several times a day and whenever you enter your home (or someone else’s home). Call a halt to large gatherings. Educate people about masks and how they should be reserved for the medical professionals who need them. All this and more should have started weeks ago.

Deciding whether to close schools is hard; they do so much more than just education. But this is a pandemic, and so you should expect they will be shut sooner or later. In Hong Kong, they have been shut for weeks. If you hear any talking head on TV explain that kids don’t get sick, remember that doesn’t mean kids cannot be infected and transmit. It’s probably a good idea to hold off on visits to Nana and Grandpa.

The most fundamental function of a government is to keep its people safe. It is from this that it derives its authority, the confidence of the people and its legitimacy. Nobody should be under the illusion that this is something that can be dodged through somehow manipulating a virus that we are only beginning to understand. This will not pass you by; this is not a tornado, it is a hurricane.

Don’t panic, but do prepare. If your government won’t help you, do it yourself. "