[Two states in the history of the concept of contagion: from Hippocrates to Galen].
The Hippocratic doctor does not believe any more in magico-religious "miasmata" that pollute whole populations; he accuses the environmental air, thus freeing his fellow-men from the fear of gods' wrath but impeding the rise of the concept of contagion and disconnecting his own experience from the vet's. Galen however observing a few cases of lepra in Minor Asia intuits human contagion.
Gourevitch
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D000818:Animals; D003141:Communicable Diseases / Q000266:history*; D000076145:Greece, Ancient; D049690:History, Ancient; D006801:Humans; D007918:Leprosy / Q000266:history; D008273:Magic; D008288:Malaria / Q000266:history; D012067:Religion; D015047:Zoonoses / Q000266:history