“It is not yet clear if there has been an increase in hepatitis cases, or an increase in awareness of hepatitis cases that occur at the expected rate but go undetected,” WHO said in a statement.
Experts say the cases may be linked to a virus commonly associated with colds, but further research is ongoing.
“While adenovirus is a possible hypothesis, investigations are ongoing for the causative agent,” WHO said, noting that the virus has been detected in at least 74 of the cases. At least 20 of the children tested positive for the coronavirus.
WHO said affected countries are stepping up their surveillance of hepatitis cases in children.