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Public health leaders are watching a spike in unexplained, severe hepatitis cases in children. Dr. Naveen Mittal with the University of Texas Health System says these are children who have previously been healthy, so they don't know what they're seeing. He's treating one of these cases, which has popped up in San Antonio. The World Health Organization says some of these children have tested positive for a virus that causes colds. They're telling doctors to take quick action if they see any of these suspected cases of pediatric hepatitis.