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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警方使用催泪瓦斯驱散人群,但部分民众多次返回现场,严重干扰了救援工作和现场控制。