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Sources
- 2004-05 Flu Vaccine Supply Information, CDC, October 15, 2004.
- American Lung Association
- Flu Fact Sheet, National Institute of Allergy and Infectious Diseases, April 2004.
- General Information on Avian Influenza, CDC.
- Influenza: The Disease, CDC, December 30, 2003.
- Key Facts About the Flu, CDC, October 6, 2004.
- Rosenthal, Elisabeth. "No Flu Vaccine Shortage is Reported Outside the U.S.," International Herald Tribune, October 22, 2004.
- The Flu Shot, CDC, October 7, 2004.