Despite some concerns regarding the risk of a measles outbreak at the 2019 Hajj, not a single case was identified by the Saudi Ministry of Health surveillance system, as noted by Saber Yezli and colleagues. Although measles is potentially highly transmissible in crowded settings, few documented outbreaks have been reported in the context of mass-gathering events.

中文翻译：

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群众聚会上的麻疹暴发大多发生在青年活动中。

正如Saber Yezli及其同事指出的那样，尽管有人担心2019年朝j爆发麻疹的风险，但沙特卫生部监视系统未发现任何病例。尽管在拥挤的环境中麻疹可能很容易传播，但在群众聚会事件中，鲜有爆发的报道。