Mary Wilson Carpenter - Health.jpg
 | Mary Wilson Carpenter - Health.jpg
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In 1800, infectious diseases such as tuberculosis, cholera, syphilis, and smallpox were the primary causes of illness and death, but no one knew what caused them—they were generally believed to be inherited or to be the result of bad air. By 1905, the bacteria that causes tuberculosis, cholera, and syphilis had been identified, and an effective method of preventing smallpox, had dramatically cut the number of cases. Science had begun to transform medicine.
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