Axel Scheffler, the illustrator of the Gruffalo, has illustrated a digital book for primary school age children, free for anyone to read on screen or print out, about the coronavirus and the measures taken to control it. The book has had input from a medical expert >

and a child psychologist and has been published by @NosyCrow You can download the book here: https://nosycrow.com/wp-content/uploads/2020/04/Coronavirus_INSwith-cover.pdf
If you want to print it, it's probably best landscape and slightly reduced (90%) to fit onto A4.

If the book is useful, please consider making a donation to https://www.nhscharitiestogether.co.uk/