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【单选题】
关于急性上呼吸道感染的病因与发病机制说法正确的是
A.
急性上呼吸道感染有70-80%由细菌引起，20-30%由病毒引起
B.
引起急性上呼吸道感染的常见细菌为溶血性链球菌
C.
人体对各种病毒感染后产生的免疫力时间较长
D.
当受凉、淋雨、过度疲劳后，呼吸道局部防御会增强
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