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In page Epidemic typhus:

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Typhus caused hundreds of thousands of deaths during World War II.[8] It struck the German Army during Operation Barbarossa, the invasion of Russia, in 1941.[9] In 1942 and 1943 typhus hit French North Africa, Egypt and Iran particularly hard.[10] Typhus epidemics killed inmates in the Nazi concentration camps and death camps such as Auschwitz, Dachau, Theresienstadt, and Bergen-Belsen.[9] Footage shot at Bergen-Belsen concentration camp shows the mass graves for typhus victims.[9] Anne Frank, at age 15, and her sister Margot both died of typhus in the camps. Even larger epidemics in the post-war chaos of Europe were averted only by the widespread use of the newly discovered DDT to kill lice on the millions of refugees and displaced persons.[citation needed]