He didn't GO to Liberia... He lived there & frequently visited the US on a visitor visa. Hence him having a fiancee here. He was probably already there before it broke out. But I can't be sure of that.
As for why didn't his family get sick: he wasn't as contagious when he was at home. The sicker you get, the more contagious. Also, his family members weren't giving him dialysis & blood transfusions or changing his bed pans when he was too weak to move.
I mean, I don't know everything about this case. But if you care to ask the right questions, answered aren't too hard to find.
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"Simplicity is the key to brilliance." - Bruce Lee
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