The experience of World War I made popular the concept of medical geography (geomedicine in English, geomedizine in German), which became part of Nazism's philosophy of national welfare, safety, and solidarity. The Nazis used it to create propaganda to show some groups as rats, vermin, and Untermenschen (subhumans). In this way, more than 10 million people were killed under the Nazi regime: 6 million Jews, plus more than 5 million Gypsies, Jehovah's Witnesses, and other individuals who were not part of the German theory of "master race." The Germans' fear of typhus that spread in the Wehrmacht was so immense that during the occupation, Polish doctors used this phobia to organize a resistance movement. Contemporarily, the scope of geographic medicine encompasses the following research areas: spatial differentiation of disease incidents and the process of disease diffusion, geographic inequalities in the population's health level, and morbidity determinants among the inhabitants of developing countries. In the first half of the 19th century, it played an essential role in the activities aimed against epidemics of infectious diseases, including louse-borne typhus (epidemic typhus), cholera, and typhoid, linking these diseases to cultural determinants. Under the influence of this idea, the concept of doctor-hygienist emerged, and social medicine began to evolve.
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