Among the puzzling outcomes of the coronavirus, which has killed more than six million people worldwide since it first emerged in 2019, are the symptoms suffered by children.

More than 12.7 million children in the US alone have tested positive for Covid-19 since the pandemic began, according to the American Academy of Pediatrics. Generally, the virus doesn’t hit kids as severely as adults.

But, as with some adults, there are still bizarre outcomes. Some youngsters suffer unexplained symptoms long after the virus is gone, what’s often called long Covid-19. Others get reinfected. Some seem to recover fine, only to be struck later by a mysterious condition that causes severe organ inflammation.

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