From Citizendium, the Citizens' Compendium
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- Influenza at the Centers for Disease Control and Prevention
- Influenza at World Health Organization
- Health encyclopedia entry at NHS Direct
- BioHealthBase Bioinformatics Resource Center Database of influenza sequences and related information.
- Overview of influenza at MedicineNet
- Orthomyxoviridae The Universal Virus Database of the International Committee on Taxonomy of Viruses
- Influenza Virus Resource at the NCBI