The concentration of acid in vomitus or aspirate need not reach this limit. 嘔吐物或吸引液內酸的濃度不需要達到這一程度。
The infection can spread through the consumption of contaminated food or direct contact with the vomitus or excreta of infected persons. 此類感染可以由進食受病毒污染的食物及直接接觸病人的嘔吐物或糞便而傳播。