And though most scientists hail vaccines as one of public health’s greatest achievements, they have provoked fear, distrust, and contentious resistance since Edward Jenner invented the first vaccine, to prevent smallpox, in the late 1700s.
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Three years later he was ready.，推荐阅读爱思助手下载最新版本获取更多信息
Brighton’s yoga-mad, teetotal veteran on the secrets to his longevity after 24 seasons in the English top flight