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| 1900–1904 || ''{{w|Cordon sanitaire}}'' || || "During the San Francisco plague of 1900–1904 San Francisco's Chinatown was subjected to a cordon sanitaire" ||
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| 1901 || {{w|Disinfectant}} || || "The Meyer conducts the first systematic experiment on the nature of the antibacterial action of phenols, however, was due to {{w|phenol}}s. Meyer (1901) who showed shows that the antibacterial action of phenols was is paralleled by their distribution between protein and water, suggesting that protein was is the prime target."<ref name="Hugo"/> ||
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| 1902 || ''{{w|Cordon sanitaire}}'' || || "In 1902, Louisiana imposed a cordon sanitaire to prevent Italian immigrants from disembarking at the port of New Orleans. " ||
