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Semmelweis noticed that the death rates in mothers during pregnancy was unusually high. He noticed that the doctors in his hospital were going straight from examining diseased dead bodies in the morgue to delivering babies, and thought that perhaps this meant that they were transferring disease from the corpses to the mothers. He suggested that all doctors thoroughly wash their hands between patients, and almost immediately the Death Rate fell.
This was the first time that the idea of infectious disease (passing disease via a pathogenic medium, i.e. bacteria and viruses) was considered. before this, contracting diseases was put down to chance.
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