Novel H1N1 flu is a new and very different influenza virus that is spreading worldwide among people. This new virus was called "swine flu" at first becuase it has pieces of flu viruses found in pigs in the past. However, H1N1 has not been detected in U.S. pigs.
Influenza is unpredictable, but scientists believe that the new H1N1 virus will cause illness, hospital stays and deaths in the United States over the coming months. The flu season, the new virus may cause a lot more people to get sick than during a regular flu season. It also may cause more hospital stays and deaths than flu seasonal flus.
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