In 1847, Ignaz Semmelweiss reduced death rates on his maternity ward by insisting that his doctors washed their hands before operating. His discovery was mostly ignored.
In 1861, Louis Pasteur published his Germ Theory, which proved that germs caused disease and infection.
In 1865, Joseph Lister developed and used a carbolic spray to kill germs in the operating theatre. At first, he faced a lot of opposition because the spray was large and awkward to use and many surgeons were cynical about it's effectiveness.
However from 1866 onwards, opposition to his work was slowly overcome.
In 1890, William Halstead recommened that rubber gloves be used during surgery-this was the beginning of aseptic surgery.
It was also during the 1980s that Robert Koch discovered that hot steam killed more germs than carbolic acid.
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