Via The Washington Post: Why doesn’t coronavirus make kids sick with covid-19? Excerpt:

One of the few mercies of the spreading coronavirus is that it leaves young children virtually untouched — a mystery virologists say may hold vital clues as to how the virus works.

In China, only 2.4 percent of reported cases were children and only 0.2 percent of reported cases were children who got critically ill, according to the World Health Organization. China has reported no case of a young child dying of the disease covid-19.

Meanwhile, the new coronavirus has proved especially deadly on the other end of the age spectrum. The fatality rate in China for those over 80 is an estimated 21.9 percent, per the WHO. For ages 10 to 39, however, the fatality rate is roughly 0.2 percent, according to a separate study drawing on patient records of 44,672 confirmed cases. And fatalities and severe symptoms are almost nonexistent at even younger ages.

That means the new coronavirus is behaving very differently from other viruses, like seasonal influenza, which are usually especially dangerous for the very young and very old.