Calf scours It is important to recognize and treat calf scours early.
If it occurs after 7 days of age, it is most likely caused by a virus. If it occurs after 21 days of age, it is most likely due to coccidiosis. After saying this, it is always important to work closely with your veterinarian to make a diagnosis. If you don't know the cause, you don't know what to do to prevent future calves from getting it, and also what drugs and treatments are required. There are diseases that can be prevented by the use of vaccines.