1. Murphy B, Webster RG. Orthomyxoviruses. In: Fields BN, Knipe DM, Howley PM, Chanock RM, Melnick JL, Monath TP, et al., editors. Fields virology. 3rd ed. New York: Raven Press; 1996. p. 1397-445.
2. The impact of influenza epidemics on mortality: introducing a severity index.;Simonsen;Am J Public Health,1997
3. Prevention and control of influenza. Recommendations of the Advisory Committee on Immunization Practices (ACIP).;Bridges;MMWR Recomm Rep,2001
4. Mortality associated with influenza and respiratory syncytial virus in the United States.;Thompson;JAMA,2003
5. Homeland Security Council. National strategy for pandemic influenza. 2005 [cited 2006 Apr 14]. Available from http://www.whitehouse.gov/homeland/pandemic-influenza.html#section3