"Given the interconnectedness of our world, there's no such thing as 'it stays over there and it can't come here,'" said Dr. W. Ian Lipkin, a Columbia University MERS expert.
CDC confirms first case of MERS virus in American →
"Nobody expected Nipah. Nobody expected HIV. Nobody expected SARS," he said.
Uh-oh: Scientists say film 'Contagion' is for real →