Unexplained hepatitis is not more common in U.S. children than before the pandemic, a C.D.C. study suggests.

Officials have also been trying to determine whether the cases represent a new phenomenon or are simply a new recognition of one that has long existed; there have always been a subset of pediatric hepatitis cases with no clear cause.

cluster of cases of severe hepatitis, or liver inflammation, in previously healthy children, which date back to October 2021.  Read the full story in The New York Times.