美国疾病控制和预防周三证实，他感染了猪流感病毒。
The U. s. Centers for Disease Control and Prevention on Wednesday confirmed that he had been infected with the swine flu virus.
美国疾病控制与预防中心称在全国范围内每年有一例人类感染猪流感病毒的报道。
Nationally, the CDC typically receives about one report of swine flu virus in a human each year.
很可能多数人，尤其是不经常接触猪的人，对猪流感病毒没有可预防病毒感染的免疫力。
It is likely that most people, especially those who do not have regular contact with pigs, do not have immunity to swine influenza viruses that can prevent the virus infection.
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