Relating to or caused by coccidia; descriptive of infections or organisms belonging to the coccidian protozoan group.
From coccidia + -an (suffix creating adjectives); used interchangeably with coccidial in medical and veterinary contexts.
Both 'coccidian' and 'coccidial' are correct, showing how English medical terminology has built-in redundancy—doctors learn both forms but might use the same one consistently.
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