You mean selfish. If the infected guys chose to remain in Africa to avoid any chance of infecting fellow Americans, that would be selfless.
If we abandon them to their fate because we're (not unreasonably) frightened, that's selfish.
We are not abandoning them. They made the choice on their own free will to go. They should be selfless and stay put rather than endanger more lives with an incurable virus.
Who said they were abandon to their fate? It’s not as if we don’t have hundreds of other medical personnel and equipment over there.