03/14/2025, 01:09 AM UTC
疫苗如何战胜疾病How Vaccines Have Beaten Diseases
➀ 疫苗自1796年5月14日爱德华·琴纳首次接种天花疫苗以来就已经存在。
➁ 如脊髓灰质炎和天花等疾病已经被根除，与美国数十年来没有新病例相比，20世纪每年平均超过10,000例。
➂ 近年来，根除麻疹的进展已经放缓，但仍然远低于20世纪每年平均五十万病例的水平。
➀ Vaccines have been used since May 14, 1796, when Edward Jenner first vaccinated against smallpox.
➁ Diseases like polio and smallpox have been eradicated, with no new cases in the United States for decades, compared to over 10,000 cases per year in the 20th century.
➂ Progress in eradicating measles has slowed in recent years but remains significantly lower than the 20th century average of half a million cases per year.
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