influenza virus
noun
: any of the orthomyxoviruses that belong to three genera (Influenzavirus A, Influenzavirus B, and Influenzavirus C) and that cause influenza A, influenza B, and influenza C
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“Influenza virus.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/influenza%20virus. Accessed 30 Oct. 2025.
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