School closures, new work-from-home realities, social distancing, and scary words like "quarantine" are quite a lot for even grown-ups to deal with, and it is natural that kids might feel frightened and confused, too. The following links may prove useful as you navigate this uncharted territory.
NPR has a great and accessible comic about Coronavirus, perfect for sharing with kids.
The NYT has a great article from a psychologist about how to approach this conversation with different age-range children, from preschool to high school.
TeachingKidsNews.com is a site that breaks down newsworthy topics of the day into a kid-friendly format, with discussion questions at the end. Their article about Coronavirus is quite rational and calming. They also have good tips on talking to your littles about other hard news topics, as well. (Note that this website is based in Canada, but the info is good for the US as well!)