re: Ebola Nurse in Maine Takes a Bike Ride - Cops Follow

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I have to admit that this was the first I heard of it and had, like NC_Tigah

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Fever doesn't render one contagious. Fever is a physiologic harbinger. Ebola can progress very rapidly from outset of fever to onset of GI distress. That, my friend, is when Ebola becomes a dangerously contagious threat.

Likewise, risk is of course situational.

If you plant an asymptomatic carrier on a 10-minute train ride adjacent to other passengers, those passengers stand no chance of infection.
If you plant an asymptomatic carrier on a 10-day cruise, there is likelihood that by cruise-end the Ebola carrier will have become contagious (emesis/diarrhea).
If you plant a febrile carrier on a 2-hr flight, there is likelihood that by flight-end the Ebola carrier will have become contagious (emesis/diarrhea).

Sort of basic stuff mmcgrath.