Relating to or caused by balantidium, a parasitic organism that infects the intestines.
From 'Balantidium' (a genus of parasitic protozoans) plus '-ial' (relating to), following medical terminology conventions for adjectives describing disease-causing organisms.
Balantidium coli is one of the largest parasites that can infect humans, and pigs are its main reservoir—which is why it's rare in countries with strict food safety regulations.
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