求翻译：猪流感是一种由Ａ型猪流感病毒引起的猪呼吸系统疾病，该病毒可在猪群中造成流感暴发。通常情况下人类很少感染猪流感病毒。近年在美国等地也出现过人感染猪流感病例，患者大多为与病猪有过直接接触的人。是什么意思？

Swine flu is a respiratory disease of pigs caused by type A swine influenza virus, the virus can cause influenza outbreaks in pigs. Under normal circumstances, human beings rarely infected with swine influenza virus. In recent years, cases of human infection with swine flu in the United States and o

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Pig flu is one kind the pig respiratory disorder which causes by the A pig flu virus, this virus may create flu in the pig group to explode.In the usual situation the humanity very little infects the pig flu virus.Recent years in places such as US also appeared the excellent infection pig flu case o

Swine flu is a porcine respiratory disease caused by type a influenza virus in pigs, the virus can cause outbreaks of influenza in pigs. Typically humans rarely infected with swine influenza viruses. In recent years in the United States, and there have been cases of human infection with swine flu, p

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