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.
马怀龙是山东省青岛市公安局市北分局兴隆路派出所社区民警,转业从警17年来,除了守护一方平安,他还长期照顾这49把钥匙对应的49户孤残困难家庭。钥匙上没有编号和姓名,但每到一户人家,老马总能准确抓出对应的那一把。
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