How do I explain to a 3-year-old kid about COVID-19?

At this age children can be taught by showing the visual content or by your own actions. Below are few things to make them understand the Covid-19 and its harmfulness towards us. 1. YouTube is the best platform to search for a video on Covid-19 explaining it and how to avoid getting infected through it. 2. Children copy the people around them so make sure you take all the possible actions to avoid this infection like wearing a mask while going outside or meeting someone after a long time, using sanitizer when required ,how to do a hand wash ,