| http://www.w3.org/ns/prov#value | - Thus in India plague mortalities first increased for a decade or more, then jumped randomly from year to year before declining in the 1920s, as a result of rats (not humans) acquiring immunity to the bacillus.57 Similar patterns can be seen in Brazil, Thailand, Vietnam, and other subtropical regions later in the century, even after the introduction of DDT, the use of effective antibiotics, and mod
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