: a genus of small reddish brown nematode worms (family Diplogastridae) including several species infesting the small intestine of sheep, goats, and cattle and sometimes held responsible for marked catarrhal inflammation, anemia, and diarrhea

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“Cooperia.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Cooperia. Accessed 7 Jul. 2026.

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