Clinical disease most commonly occurs in calves around weaning due to an increase in stress and is rare in adult cattle. Coccidiosis can range from subtle disease to severe illnesses that can result in death. Clinical signs can appear up to 17 days after ingestion of the oocysts. “Affected animals may be treated with specific medications to control the infection,” said Dr. John Gilliam, food animal clinical professor. If you have an animal who shows clinical signs of coccidiosis, contact your local veterinarian.