Apparently at least some patients early in their illness don't necessarily have enough of a viral load to become wildly contagious to others and apparently don't shed virus that lives very long at all out in the environment off its host or Duncan's fiancee/family who kissed/hugged him, lived in very close quarters with him would have certainly caught it.
Neither Dr. Brantly and Nurse Writebol are sure how they got the virus, though both have said it could have been from contacts in the community, which apparently was/is teeming with contagious people going about looking after themselves as long as they can, looking for help, hiding their symptoms for as long as possible for fear of rejection/shunning. Or they each could have had an inadvertent breach of protocol from working long, hot, miserable shifts or inadequate/failure of their suits - vent/exhaust leaks. The gear is all burned so there is no way to back-check it. But as they both got sick about the same time, as did Pham and Vinson working with Duncan, I suspect it could have been the same patient back in Liberia whom they both got it from, whatever happened.
__________________  Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |