1. Update: infections with a swine origin influenza A (H1N1) virus—United States and other countries. April 28, 2009;MMWR,2009
2. Outbreak of swine-origin influenza A (H1N1) virus infection—Mexico, March-April 2009;MMWR,2009
3. Swine influenza H1N1: diagnostic dilemmas early in the pandemic;Cunha;Scand J Infect,2009
4. Influenza;Crosby,1993
5. Influenza: clinical features;Debré,1970