COVID - 19: How to explain to kids?

I made a short video for my students, to explain this coronavirus pandemic in terms that they might understand. I have long admired Fred Rogers' advice:

If it’s mentionable, it’s manageable. 

If we talk about tough issues, we can handle them; we’re not as scared. I believe it is really important to convey this courage to children, to let them know that we are here for them, we are keeping them safe. Here's the text of my video:

I want to talk to you about something that is on everybody’s minds these days.
 You’re probably wondering why we’re all at home, why we friends can’t be together in the same classroom, playing together.
 Maybe you’ve heard this big word:
 Coronavirus.
 Maybe you’ve wondered about it.
 Coronavirus.
 Would you clap it with me?
 [Clap out the syllables of Coronavirus]
 See it’s not too big. We’ve got this!
 It’s a big, big word with FIVE syllables – yet, here’s something surprising, Coronavirus is very, very, very small. You and I can’t see it. It’s practically invisible – unless you have a very strong microscope.
 Coronavirus is a very powerful germ that can make people sick. And, because we can’t really see it, we’re not always sure where it is.
 I don’t know a lot about it, but I know there are lots of scientists, lots of adults, who are working very hard to keep us safe from Coronavirus. Lots of people all around the world are thinking about this, working on it. We are in a whole big community of people asking questions about this.
 And we know how to stop it!
Oh, yes, we do!
We have good ideas about not spreading this virus.
n  need to wash our hands thoroughly - you can sing along while you wash your hands, a song makes the soap bubbles last longer, as you clean your hands all over.
n  You can be sure to cover a cough or sneeze with your elbow
n  If you hear someone cough or sneeze, you can move away from them, give them a little space...maybe go get the box of tissues for them
n  And, we have to spend time apart. That’s why school is closed.
 If we can spend time apart, we won’t pass Coronavirus to others, and we won’t grow it, in our world. That is a very kind thing!
 It’s pretty strange to not be in our classroom together,
But,
Here’s the good news:
We get to be with our families during this time.
There’s lots of things to do at home, too!
And we get to be resourceful.
 We need to see each other through the computer, through pictures. We can talk on the phone together, too.
 We have always been thinkers.. We can think of fun and interesting things to do at home:
 Building.
Drawing.
Writing.
Tell stories!
 You could also think like a scientist. What do you think we could do to make Coronavirus go away faster? What if you get out some paper and give it a think, draw and write what you imagine. I wonder what it looks like! What magic can you create that makes this virus go away, stop making people so sick.?
 Also, what is something kind that you can do? What is something you can do to help your family? Show your family what the we do every day!
 We’re still going to have lots of fun together, just like we always do. For a while, we need to be together separately!
 We can share our fun ideas with each other, too. Send me a picture of what your are building, what you are drawing. Tell me a story when I call you on the phone. We’re going to make this time apart be a time when we are still together in our hearts.
   If you start to feel worried or frustrated about it, remember the rule of three – Three Deep Cleansing Breaths! Let’s do that now.

[Take three deep breaths together.]

 I care about you.