Read the article m8
i don't think anybody stood by the guy with ebola for eight days straight.
i'm pretty sure the guy with ebola was transferred safely and securely to USA and to the hospital, and has been put into a quarantine zone so that the only people who enter have proper gear on.
if you put two humans in a cage side by side, having only a small fence to seperate them and they were always by eachother, give one a disease and keep them there for eight days, the other is bound to get it. it's not surprising that the two animals ended up both getting the disease since they were right by each other, and can happen with pretty much every disease.