bird flu

noun

: avian influenza
specifically : severe often fatal influenza A caused by strains of a subtype (H5N1) of the causative orthomyxovirus that have produced epidemics in domestic birds especially in Asia with sporadic associated human infections

Examples of bird flu in a Sentence

Recent Examples on the Web
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However, earlier this week, the Trump administration canceled a $766 million agreement with Moderna that was dedicated to developing vaccines for potential pandemic influenza viruses, including the H5N1 bird flu. Mandy Taheri, MSNBC Newsweek, 31 May 2025 The cancellation comes after Moderna received positive interim data from a trial testing the safety and immunogenicity of its H5N1 bird flu vaccine candidate. Judy Stone, Forbes.com, 29 May 2025 Bird flu The Department of Health and Human Services has terminated a $590 million contract with Moderna to develop a vaccine that would protect against bird flu. Jade Walker, CNN Money, 29 May 2025 The Trump administration has cancelled a contract awarded to Moderna for the late-stage development of its bird flu vaccine for humans, as well as the right to purchase shots, according to the drugmaker. Patrick Wingrove, USA Today, 28 May 2025 See All Example Sentences for bird flu

Word History

First Known Use

1972, in the meaning defined above

Time Traveler
The first known use of bird flu was in 1972

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Cite this Entry

“Bird flu.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bird%20flu. Accessed 8 Jun. 2025.

Medical Definition

bird flu

noun
: avian influenza
specifically : severe often fatal influenza A caused by strains of a subtype (H5N1) of the causative orthomyxovirus that have produced epidemics in domestic birds especially in Asia with sporadic associated human infections

More from Merriam-Webster on bird flu

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