[jamses]

Mortality-wise it looks to be around 20x worse than flu, and easy to spread before outward symptoms manifest. There's no vaccine, so the usual partial herd immunity isn't present, and no confirmed treatments yet beyond trying to help your own immune system. As you say, it will probably be mild for most people who catch it (but who wants to risk "probably"), but certainly worse if you're not in good shape.

Panic buying is just like a rush on the bank; if everyone buys more than usual there will be a temporary shortage of stock, and no-one wants to be caught short on the loo. People are anticipating needing to self-quarantine for 2+ weeks (probably more if you need to isolate your whole family), but without knowing which two weeks the timer starts. And people are probably vaguely aware that there will be a supply crunch in a few months because China's manufacturing lines have been slowed and the knock on effects haven't fed through yet.