【单选题】【消耗次数：1】
自然灾害发生后，传染病的发病可能呈现一种阶段性的特征。在突发性自然灾害发生时，灾后早期的主要威胁是：
①
呼吸道传染病
②
肠道传染病
③
虫媒传染病
④
人畜共患传染病
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