In rare cases, humans contract swine flu from close contact with pigs.

在很少一些案例中，人类因与猪密切接触而感染猪流感。

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Pigs are flu sponges, capable of contracting both bird and human viruses that can jump across the species barrier, Richt says.

里希特说，猪是流感海绵，能够跨跃物种界线吸取人类和禽类的流感病毒。

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How does swine flu spread among pigs?

猪流感在猪群中如何传播？

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Swine flu is a respiratory sickness caused by an influenza virus that mainly infects pigs.

VOA: special.2009.04.29

The virus is commonly called swine flu because it contains some genetic material from pigs.

VOA: special.2009.05.06

Studies in guinea pigs have shown that flu is easier to transmit in cold, dry conditions.

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In 1988, in an apparent swine flu infection in pigs in Wisconsin, there was antibody evidence of virus transmission from the patient to health care workers who had contact with the patient, the CDC said.

CNN: CDC confirms 7 cases of swine flu in humans

Egypt has ordered the nation's quarter of a million pigs to be slaughtered over swine flu fears, in the first such move in the world, even though experts say the virus cannot be transmitted by eating meat.

BBC: Africa awaits two swine flu tests