Studies have shown that the swine flu H1N1 is common throughout pig populations worldwide, with 25 percent of animals showing antibody evidence of infection.

研究表明H1N1猪流感在全世界猪群中都比较普遍，并且抗体证据表明有25%的动物被感染过。

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So far, the swine flu causing global health concerns has not turned up in U.S. pig herds.

迄今为止，猪流感引起全球健康问题，在美国猪群中没有感染。

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The other six can be traced to the North American pig outbreak, which turned out to include a combination of avian, swine and human flu.

另外6个片段则可溯源至北美猪流感的爆发，并混合了禽流感、猪流感和人流感病毒。

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But hog is a term commonly used for any swine, especially a domesticated adult pig.

VOA: special.2009.07.21

The European Union introduced a ban on 14 August on the export of live pigs and pig semen from England, after an outbreak of swine fever was reported in East Anglia on 8 August.

BBC: EU vets ease pig ban

The city's health code specifically forbids it, forcing pig owners in the nation's largest metropolis to keep their swine secret or take the risk an unhappy neighbor might squeal.

WSJ: Pigs May Fly Before Finding a Legal Home in the City

The city's health code specifically forbids it, forcing pig owners in the nation's largest metropolis to keep their swine secret or take the risk an unhappy neighbor might squeal.

WSJ: New Yorkers boldly flout law to keep pigs