周三，麦当劳（MCD.US）开盘下跌7.1%，创2020年3月以来最大跌幅，截至发稿，下跌5.32%，报297.963美元。消息面上，当地时间10月22日，美国疾控中心在官网发布调查报告，称全美有10个州出现食物引发的大肠杆菌感染事件，已有49人生病，包括一名儿童在内共有10人入院接受治疗，另有1名居住在科罗拉多州的老人因感染死亡。这些患者都表示，在出现病症前曾在麦当劳用餐，且都食用了同一款汉堡。

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