" The last big deadly human influenza epidemic in the world was in 1918. There were about twenty million dead worldwide, including five hundred thousand in the United States. Based on our present population, the equivalent number of dead now would be approximately one and a half million people. Could you imagine such a thing today? And the 1918 virus wasn’t particularly virulent, and of course, travel was much slower then and less frequent. Today, the highways and skyways can spread an infectious virus around the world in days. "

― Nelson DeMille , Plum Island (John Corey, #1)