In January 2022, doctors in Scotland noticed a worrying trend: a scattering of cases of severe hepatitis in kids between 1 and 5 years old. The children were presenting with gastrointestinal symptoms—abdominal pain, diarrhea, vomiting—followed by the onset of jaundice. To see such acute hepatitis (a broad term that essentially describes inflammation of the liver) in young, previously healthy children was highly unusual—and a cause for concern.
By April 5, the Scottish health authorities had recorded 11 cases. Unable to pin down their cause, they notified the World Health Organization, kicking off a global investigation that has left health authorities searching for
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