Hepatitis cases rising among children globally but cause remains a mystery

Researchers are investigating possible links to Covid-19, which has already been shown to cause liver problems in some patients

A dangerous and mysterious illness continues to spread among children, and so do questions over what's causing it, including possible links to Covid-19. But it's too soon to tell what is behind the cases, experts say.

More than 600 cases of hepatitis with no known cause have been identified around the globe since October 2021, and many of the cases are in previously healthy children now stricken with severe illness.