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> That's specifically about doctors washing their hands to prevent disease.

Not prevention of disease, but preventing its spread.

Doctors were a common transmission vector of infectious disease across history.

I don't see a meaningful distinction between "preventing disease" and "preventing spread of disease" in this context given we're talking about pathogens.

The doctor isnt the one in danger dying or getting sick, that seems like a big distinction and probably the reason people were skeptical of it.

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