America's outbreak of mysterious hepatitis will continue 'throughout the summer' and many cases are already undiagnosed, a top virologist warned Friday — as the global death toll hit 12 with five fatalities in the United States.Scientists are puzzled by the cause, but leading theories suggest a type of adenovirus spread by touching feces-contaminated surfaces is behind the illness.Dr Matthew Binnicker, the director of clinical virologist at the Mayo Clinic in , told DailyMail.com cases will continue to crop up throughout the year as its transmission does not 'tend to be seasonal'.
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