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美国国务院周四向全球发出最高级的第4级旅游警示，吁国民在新冠疫情下不要出国。

美国国务院发出的第4级“切勿外游（Do Not Travel）”旅游警示指，因新冠疫情影响，建议包括居于外地的所有美国人，避免一切的国际旅游；并呼吁所有美国人，除非打算在外地无限期停留，否则，若身处的国家仍容许商务航班离境的话，应该立即回国。

旅游警示亦警告，很多国家在新冠肺炎疫情下实施旅游管制和强制隔离检疫、关闭边境、禁止非本国公民入境等措施，且往往很少作预先通知；航空公司亦会取消国际航班，部分邮轮公司也暂停营运或取消行程，若国民选择出国，行程计划有可能会严重受阻，亦可能会被迫无限期滞留外地。