There have, however, been cases of person-to-person transmission of swine flu, the CDC said.

防控中心说有人感染人的病例发生。

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Human-to-human transmission of swine flu is thought to occur in the same way as seasonal flu is spread among people, mainly through coughing or sneezing.

猪型流感可由猪只直接传染给人类及由人类传染给猪只。在人类之间的传播亦可发生。传染途径相信与季节性流感相同，主要是通过咳嗽或打喷嚏。

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While the world is agog over international transmission of the swine flu, let me take this teachable moment to remind people, animals bite back.

当世界热切希望结束国际猪流感的传播的时候，让我借此施教时刻提醒人们，动物会对我们以牙还牙。

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The World Health Organization says it needs to see clear evidence of sustained community transmission of the swine flu virus from person-to-person in at least two regions of the world before it raises its alert to the phase six pandemic level.

VOA: standard.2009.05.14

Although it's not known for sure how much benefit a surgical mask has in preventing the transmission of swine flu, people who have the illness may consider wearing one as a way to reduce the amount they cough and sneeze onto others, said Dr. Arthur Reingold, head of the epidemiology division at the University of California, Berkeley, School of Public Health.

CNN: Masks keep you from spreading illness

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