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Patricia Araujo (L), 23, who is seven-months pregnant, stands next to children as they pose in front of their stilt house, a lake dwelling also known as palafitte or 'Palafito', in Recife, Brazil, February 8, 2016. The Zika virus may be particularly adept at entrenching itself in parts of the body that are shielded from the immune system, making it harder to fight off and possibly lengthening the timeframe in which it can be transmitted, top U.S. experts said on Friday. Picture taken February 8, 2016. Nacho Doce/Reuters
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