1. Swine influenza A (H1N1) infection in two children – Southern California, March–April 2009;CDC;MMWR Morb. Mortal. Wkly Rep.,2009
2. Outbreak of swine-origin influenza A (H1N1) virus infection–Mexico, March–April 2009;CDC;MMWR Morb. Mortal. Wkly Rep.,2009
3. Antigenic and genetic characteristics of swine-origin 2009 A (H1N1) influenza viruses circulating in humans;Garten;Science,2009
4. Investigation of susceptibility of influenza viruses A (H1N1), the cause of infection in humans in April–May 2009, to antivirals in MDCK cell culture;Romanovskaia;Antibiot. Khimioter.,2009
5. http://www.who.int/csr/resources/publications/swineflu/en/.