Coccidiosis is a protozoan disease that most cattle develop some immunity to, while continuing to shed a few oocysts in their feces. Calves are the most vulnerable because they have the least immunity, particularly if they ingest a high number of immature protozoa in a dirty environment that overwhelm their immune system. James Hawkins, DVM, Jackson, MS, says young calves kept in a drylot or small pen are most at risk because the environment’s contamination tends to be ...

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