Do Humans Get Swine Flu?
Normally, swine flu bugs don\'t infect people. Historically, there\'s a case every year or two in the U.S. among people who have contact with live pigs.
But from December 2005 to January 2009 there was an uptick in swine flu cases. There were 12 human swine flu infections during this time. Eleven of these people had direct or indirect contact with pigs; in the twelfth case it was not known whether there was pig contact.
It\'s possible this uptick was due to improved reporting systems, but the CDC says genetic changes in swine flu viruses and other factors might also be a factor.
The new swine flu virus is different. It\'s not yet clear that it\'s here to stay. But it is infecting humans, and that has world health officials keeping a close eye on it.
3、 猪流感会在人群之间蔓延吗?
美国发现的感染猪流感病人没有直接接触过猪.CDC说这种感染可能是大范围内的人-人传染个案.
Can Swine Flu Spread From Person to Person?
The U.S. residents infected with swine flu virus had no direct contact with pigs. The CDC says it\'s likely that the infections represent widely separated cycles of human-to-human infections.
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