Nobody knew then, nor does anybody know now, where emerging viruses are going or what one of them might become. The human host has been gathering itself into gigantic supercities, teeming urban megahives packed with tens of millions of individuals jammed into a small space, who are breathing one another’s air and touching one another’s bodies. The supercities are growing larger all the time. Many of the world’s largest supercities are crowded with people who have little or no access to doctors and medical care. The cities are connected by airline routes, and the human host has zero immunity to
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