People ― and more of them ― are living much closer together, driving up the risk for an outbreak in a massive urban center. Worldwide travel makes the spread of something like this easier than ever before. And the changing environment ― from different exposure to parts of the world, a general disregard for habitat and continuous climate change ― means humans are seeing things they haven’t faced before, in areas that have never seen them before.
— Read on www.huffpost.com/entry/outbreaks-epidemic-preparedness_n_5b4f85fbe4b0de86f4892daa