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Photo Gallery: Plague

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This building near Harbin, China, was host to Japanese germ warfare experiments during World War II. The boxes were for breeding rats, the vehicles for fleas infected with plague. Upon release these rat agents carried the Black Death—as well as cholera and anthrax—to infect enemy Chinese. Plague is still studied by governments and terrorist organizations for possible germ warfare applications. Photograph by Jason Lee/Reuters/Corbis