As per news, coronavirus is more dangerous to elders compared children
Kids are also great at spreading viruses even if they don't get very sick from them. In some ways that makes it worse because if they don't have obvious symptoms then they could be more likely to transmit it as no one is monitoring them closely.
I read many governments are already planning for "sick leave" just to make sure that kids will be protected and prevented from doing the above.
And in an unrelated note, I remembered the movie "28 days later" and its fantastic soundtrack!