Well, it’s spread by sweat and can live for days in the shade down to 40 degrees.
Now think about pubic transportation, taxis, elevators, restrooms, etc.
The Liberian who took it to Nigeria was well enough to pass exit screening and subsequently infected the person sitting next to him on the airplane -who subsequently died.
The Liberian was visiting family. He lived in Minnesota.
also spread by urine
now think about public transportation restrooms etc