The virus is transmitted to humans by close contact with infected birds or their excrement, and cannot be passed from human to human.

该病毒通过与受感染的鸟类或其粪便的密切接触传播给人类，不能在人与人之间传播。

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The virus can also be spread by hands infected with the virus.

病毒还可通过感染病毒的手来传播。

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More than 500,000 people are now believed to have died from AIDS in the United States, with almost 900,000 estimated to be infected with the virus.

自发现艾滋病病毒以来，美国死于艾滋病的人数累计已经超过50万人，感染人数累计约为90万人。

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El Paso Port Director William Molaski says officers are trying to identify people who might be infected with the swine flu virus.

VOA: standard.2009.04.30

Also Thursday, authorities in Hong Kong ordered the closure of all elementary schools, kindergartens and day care centers in the city after 12 students were found to be infected with the virus.

CNN: Swine flu 'not stoppable,' World Health Organization says

Almost half of South Africa's mineworkers are said to be infected with the HIV virus.

BBC: Sunday 23/01/2000 BBC 2 19.30hrs

Graham Cluley, senior technology consultant at anti-virus company Sophos, said the virus had been known about since the end of June and anyone with up to date anti-virus software was unlikely to be infected by it.

BBC: Pokemon virus contained