- Bacterial diseases: These diseases are caused by prokaryotic unicellular organisms, bacteria, affecting animals of all ages and species with a wide range of disease symptoms.
- Viral diseases: These diseases are caused by viruses, acellular microorganisms, such as influenza, rabies, and foot-and-mouth disease viruses. Viral diseases can spread rapidly through animal populations, causing significant economic losses.
- Fungal diseases: These diseases are caused by fungi, such as ringworm and aspergillosis. Fungal diseases can affect the skin, respiratory system, and other organs.
- Parasitic diseases: These diseases are caused by parasites, such as fleas, ticks, mites, and worms. Parasitic diseases can cause a variety of symptoms, including anemia, weight loss, diarrhea, and skin irritation.