| Nineteenth
Century |
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| • | 1849 Dr. John
Snow |
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| • | 1850 Lemuel
Shattuck, Massachusetts |
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| • | 1862 Louis
Pasteur’s germ theory disproved |
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| spontaneous
generation |
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| • | 1876 Robert
Koch: a particular microbe and no |
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| other causes a
particular disease |
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| • | 1872 American
Public Health Association |
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| founded |
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| • | 1890
pasteurization of milk |
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| • | 1895 septic tanks
introduced |
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