Right now it really isn't that bad. I'm in London and going to work normally, the city is busy and the trains are still full in the mornings. Our company is starting to migrate people to working from home though. So a proportion of each team is wfh and staying there, for 14 days or until otherwise notified, and more will probably follow not because there is immediate danger, but because we want to be well prepared when there is.
If the markets are like this when there are a few hundred cases in the UK and US, what will they be like when there are tens, or hundreds of thousands of cases and major cities are in lockdown?
Back to investing, stocks are down significantly and it's quite possible now is a good time to start buying, for those with the capital. Maybe spreading out a balanced equity investment portfolio over the next several months. I don't know if or when the market might go lower, or by how much, but it seems unlikely it's going to rally all that much given that we can be pretty sure there's plenty more bad news still to come. So investing too much now might miss further falls, but IMHO buying over several months is unlikely to miss the dip. That's how I see it anyway.