Unusual cases of hepatitis in children: Your questions, answered

A cluster of acute hepatitis cases among previously healthy children around the world, including 180 in the United States, has created concerns for doctors, scientists and parents. The cause is unknown, but some scientists say they may be linked to a common virus that causes colds, gastrointestinal distress and other minor ailments. Disease detectives also say they may also be uncovering a phenomenon that has existed, unrecognized, for years.

Inside the global hunt for a culprit in mysterious hepatitis cases

While some children have been very sick and at least 11 have died, including six in the United States, the cases remain extremely rare and are not at this point a cause for alarm, doctors say. More than two dozen children, including 15 in the United States, have had liver injury serious enough to require transplants.

Here’s what you need to know: