Have you been outside the US in the last 6 months? If you answered Yes take the left door. If you answered No take the right door and go home to self quarantine. Six months is a looong time for an incubation period. There may be worse things lurking in the bushes than Ebola. The speculation of Hiv and Ebola becoming a super plague being the big one. Possible or impossible. It would have to be verified by experimentation. Someone may have done it like NK or a secret gov program. You really have to wonder whether curosity will be the true teotwawki in the end.