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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
One was an outbreak of H5N1 with the PB2 mutation at a Spanish farm in October that led to the culling of more than 50,000 minks.
Source: https://phys.org/news/2023-02-bird-flu-mammals-humans-experts.html