- Nine children — all under six years old — have been struck down by hepatitis
- CDC bosses are investigating the causes of the cases, which are rare in children
- Hepatitis is normally triggered by its namesake viruses A to E, experts say
- But officials are probing if adenoviruses – behind common cold – were the cause
- Alabama health chiefs said at least five children tested positive for adenoviruses
- U.S. is now the third country to report the illness, behind Spain and the UK
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