A group of people living in isolation in the Amazon may have contracted the flu after visiting a settled tribe in Brazil, which could have deadly consequences if the infection is carried back to other members of their tribe who have never been exposed, officials said. "Unless a proper and sustained medical program is immediately put in place, the result could be a humanitarian catastrophe," said Survival International Director Stephen Corry. The five men and two women were treated and vaccinated before returning to their village this month.

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