It is already beginning, as it spreads to all parts of the World it will eventually strike and go from Human to Human. This has the potential to kill Hundreds of Millions, possibly Billions. I don't know, it may be Nature's way of Population Control, 3 Billion people dead would greatly decrease growth for decades. Then again I do not think we have anything to worry about here in the USA as long as it doesnt get to South America, those countries are poor and underdeveloped so it would likely easily sweep through there to Central America, and into the States. Still, America cannot afford NOT to be prepared, medicines and medical care should be ready, maybe a vaccine to make Humans Immune.