Scientists and health officials are investigating upticks in severe hepatitis cases among young children in the U.S. and Europe, according to Science. While a majority of cases (74) have occurred in the U.K., nine cases have been confirmed in Alabama, the state’s health department said April 15. The children, all younger than 10, reported gastrointestinal symptoms and had varying degrees of liver injury. Two had to receive liver transplants.  The CDC is working with Alabama health officials and pediatric healthcare providers to investigate the cases.