A new study points to prior COVID-19 infection as a possible culprit for the global wave of severe hepatitis cases among children — though experts caution the true cause is still a medical mystery.

Researchers in Israel added evidence for the theory in a small study published in the Journal of Pediatric Gastroenterology and Nutrition, suggesting some children might develop liver inflammation in the weeks after recovering from a mild COVID-19 infection.

While the root cause of the pediatric hepatitis outbreak is still unknown, experts say the leading theories include COVID-19 infection, infection with a common cold virus, or an interplay between the two infections, according to Dr. Alok Patel, a pediatric hospitalist at Stanford Health and an ABC News medical contributor.

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