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It was first proposed in the mid 1850s by doctor Ignaz Semmelweis who believed it would reduce mortality rates. It became a widespread thing around 1900 when everyone started doing it because they realized how important decontamination was.
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Answer:

In the 1800s.

Explanation:

In the 1800s, healthcare workers first used a chlorine solution for hand hygiene. Hungarian physician Ignaz Semmelweis noticed a high death rate in the maternal clinic, so he asked workers to start disinfecting their hands with a chlorine solution between patient contacts, which resulted in a drop in maternal death rates.

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