Geographic dependence, surveillance, and origins of the 2009 influenza A (H1N1) virus.

@article{Trifonov2009GeographicDS,
  title={Geographic dependence, surveillance, and origins of the 2009 influenza A (H1N1) virus.},
  author={Vladimir A. Trifonov and Hossein Khiabanian and Ra{\'u}l Rabad{\'a}n},
  journal={The New England journal of medicine},
  year={2009},
  volume={361 2},
  pages={
          115-9
        }
}
Segments of the 2009 human H1N1 strains have coexisted in swine influenza virus strains for more than 10 years. Vladimir Trifonov, Hossein Khiabanian, and Raul Rabadan describe the evolution of the H1N1 virus. 
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