No "exchange" necessary, only contact with the virus, primarily through contact with bodily fluids, including sweat, from an infected person.
No "up close & personal" required.
Gee that’s good to know. And is “The One” banning any flights from these West African countries? Nope! So for all we know right now 100s of infected could be roaming around in the country.
That's not what the CDC told me and the rest of the country yesterday...you must be mistaken.
</sarc>