【中文原文】
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说这种感染可能是大范围内的人-人传染个案.
【参考译文】
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.