"Pertussis is a highly contagious disease, and outbreaks have occurred among the elderly in nursing homes and hospitals," said Karen Midthun, m.
百日咳是一种传染性极强的疾病，老人常在养老院和医院出现发病情况。
"Pertussis is a highly contagious disease, and outbreaks have occurred among the elderly in nursing homes and hospitals," said Karen Midthun, m.
百日咳是一种传染性极强的疾病，老人常在养老院和医院出现发病情况。
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