Frisco(suburb of Dallas) Patient Exhibiting Ebola Symptoms (UPDATED)

[zazen]

25. dumb question, but can people exposed to any virus not "get it?"

You seem to be very medically informed so I thought I'd pose it to you.

Is it always a question of immunity from prior infection, say like with a strain of cold of influenza, or can two people with different genetic makeups (of the same overall health and age and no prior exposure) ingest droplets accidentally sprayed on food, for example, and one contract a virus (any virus--whether Ebola, flu, or cold) and the other not?

If the latter is true, then could there be a genetic susceptibility or resistance to what is in fact a droplet-based (but small enough to be breathed in) virus that can survive in blood for x days as they've said?

EG., re something else, I've just been reading about this JAK 42/1 haplotype that 45% of people of European ancestry have, that increases risk of myeloproliferative diseases. Could something weird like that, or a mutation in IgG or IGA or whatever umpteen thousand haplotypes we don't yet know about be at work here? Or is it all a question of transmission and contact, regardless of the people who contract it?

Please be patient with the less informed here--It's a sincere question.