I think the question of how the US medical personnel contracted the disease is an important one. The disease has a pretty short incubation period if memory serves me correctly, so it seems unlikely they were exposed to it prior to being aware the disease was present. I haven't read any speculation about this. Liberia is a very screwed up society nowadays. I learned that when I spurred to search out General Butt Naked a couple of years ago.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13