In 1999, the Centers for Disease Control and Prevention (CDC) hailed vaccines as one of the ten great public health achievements of the 20th century. Over the last few decades, scientific advances have resulted in the availability of vaccines for once-fatal illnesses, and public health investments in vaccine provision have resulted in high coverage for most routine childhood vaccines.1.

中文翻译：

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疫苗非常有效，我们不能止步于此。

1999 年，美国疾病控制与预防中心 (CDC) 将疫苗誉为 20 世纪十大公共卫生成就之一。在过去的几十年里，科学的进步已经使曾经致命的疾病的疫苗变得可用，而公共卫生在疫苗供应方面的投资导致大多数常规儿童疫苗的覆盖率很高。1。