18 某大学,同宿舍的8名同学聚餐,吃了一种鱼后,出现皮肤潮红、头晕、头痛、心悸、胸闷、血压下降,荨麻疹或哮喘症状,引起中毒最可能的病原是( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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