The respiratory tract mucosa is not only the site of infection for influenza viruses but also the site of defense against virus infection.
呼吸道黏膜不仅是流感病毒的感染部位，也是防御病毒感染的部位。
These viruses which induce respiratory tract infection range over 200 types of more than 10 categories of 7 families.
引起感冒的病毒种类很多，至少涉及7个病毒科的10多类共200多个型别的病毒。
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