I'm sure there is a scientific explanation for it. If you can not scientifically explain it then you make something up. Same thing with a bacterial infection long ago before they had microscopes. They just didn't know so of course an answer had to come out of someones ass. The leaders of that period would just blame a group of people which would lead to death for them. Jews were blamed a lot through out history for things that were not understood. Superstition can kill.