Allen’s narrative is set in eastern Europe just before and during the Second World War. The subject is typhus and 2 microbiologists who were engaged frenetically in producing vaccines against it.The lives of the microbiologists—Rudolf Weigl, a German zoologist, and Ludwig Fleck, a Jewish physician—intersected in Lwow, eastern Poland. When the First World War broke, Weigl, stationed nearby to lead a laboratory to control typhus among Russian prisoners of war, recruited Fleck, then a student.
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