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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").