turn black, matching the “black coffee ground fluid” that is accumulating in your stomach and is, like the gums business, made up of your own hemorrhaged blood. Yellow fever, the protagonist of Crosby’s frequently engrossing first book, “American Plague,” is almost as deadly a virus as ebola. Few Americans realize that yellow fever was not always a disease of the faraway tropics. In 1878, an outbreak of yellow fever — the virus carried to the United States in mosquitoes from Africa — killed 20,000…
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