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11/19/2014 06:16 EST | Updated 01/19/2015 05:59 EST

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NEW YORK, N.Y. - For three weeks, Dr. John Fankhauser and his family lived in two RVs in a meadow in North Carolina, watching movies, playing cards and huddling around a fire pit — with no other campers around.

But their isolation was interrupted each morning by a visit from a public health nurse, who came to ask Fankhauser how he was feeling and to watch him take his temperature.

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