Swine influenza (swine flu) is an acute viral infection of the respiratory tract in pigs caused by type A influenza virus.
猪流感是一种发生在猪身上的高度传染性急性呼吸道疾病，由A型流感病毒引起。
Objective to study the common virus infection of elderly hospitalized patients admitted because of acute respiratory tract infections during winter and spring in Lanzhou district.
目的了解冬、春季节兰州地区因急性呼吸道感染住院的老年患者常见病毒感染状况。
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