Veterinary Technician Practice Exam

Which disease is caused by a protozoan and primarily affects cattle by attacking red blood corpuscles?

1. Bovine Respiratory Disease

2. Anaplasmosis

3. Foot and Mouth Disease

4. Mastitis

The correct answer is: Anaplasmosis

Anaplasmosis is indeed caused by a protozoan known as Anaplasma marginale, which specifically targets and infects red blood cells in cattle. This disease leads to a decrease in red blood cell count, resulting in anemia and other related health issues. Cattle suffering from anaplasmosis may show symptoms such as weakness, fever, and jaundice due to the breakdown of red blood cells. The other diseases listed do not fit the criteria described. Bovine Respiratory Disease is primarily associated with bacterial and viral infections that affect the respiratory system rather than red blood cells. Foot and Mouth Disease is a viral illness affecting the mouth and feet of cloven-hoofed animals and does not involve protozoan pathogens. Mastitis is an inflammation of the mammary gland, typically due to bacterial infection, and does not involve a protozoan or affect red blood cells.