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and caused infection or septicemia.
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The remedy was to prevent the penetration of the microorganism,
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the idea of antisepsis.
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So, Lister accepted Pasteur's insight
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that infections were not a chemical reaction,
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caused by oxidation when air touched a wound.
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Instead, infection was the result of contamination,
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from the outside, of the wound by microorganisms.
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His solution first was this,
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the carbolic spray device that he invented.
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What you did was to spray the air around the patient,
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applying carbolic acid also directly to the wound.