甲型H1N1英语词汇及问答Questions And Answers About The Swine Flu Here are a few basics about the swine flu outbreak in the U.S. and Mexico. What is swine flu? Its flu that occurs in pigs. In rare cases, humans contract swine flu from close contact with pigs. The strain circulating now is cause for concern because it can pass directly from person to person. Like routine human flu, cases of swine flu can range from mild to severe. Is the disease the same in Mexico and the U.S.? The virus appea
