Why did hospitals still remain dangerous in the 1800's? What new medical invention or practice helped make hospitals safer?

Medical intervention: the recognition and preventative measures people took to better sterilize hospital like environments

In the 1800's bacteria viruses' and infection ran ramped because of the lack of sterile equipment and practices in hospitals. One lady I can't remember her name set out to bring change to this and when she did the death rate during this time plummeted.

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