The correct option is
A. anthrax.
Explanation of the Correct Answer
Anthrax is a disease caused by the bacterium
Bacillus anthracis, not a virus. It primarily affects livestock such as cattle, sheep, and goats, and can also infect humans. The bacterium forms spores that can survive in the environment for long periods, making it a significant concern in agricultural settings.
Why the Other Options are Incorrect
B. Foot and Mouth Disease: This disease is caused by the Foot-and-Mouth Disease Virus (FMDV), which is a highly contagious viral infection affecting cloven-hoofed animals like cattle, pigs, and sheep. It leads to fever and blister-like sores in the mouth and on the feet, severely impacting livestock health and productivity.
C. Rinderpest: Rinderpest, also known as cattle plague, is caused by the Rinderpest virus, which is a member of the Morbillivirus genus. This viral disease affects cattle and other cloven-hoofed animals, leading to severe gastrointestinal and respiratory symptoms. Rinderpest has been eradicated globally, but it is a classic example of a viral disease in livestock.
D. Newcastle Disease: This is a viral disease caused by the Newcastle disease virus (NDV), which primarily affects birds, especially poultry. It can cause respiratory distress, neurological symptoms, and high mortality rates in infected flocks. Newcastle disease is a significant concern in poultry farming.
Summary of Key Points
- Anthrax is caused by a bacterium (Bacillus anthracis), making it the only non-viral disease in the options provided.
- Foot and Mouth Disease, Rinderpest, and Newcastle Disease are all caused by viruses, affecting various livestock species.
- Understanding the causative agents of diseases is crucial for effective disease management and prevention in agriculture.
Revision Summary
- Anthrax is a bacterial disease, while the others listed are viral.
- Foot and Mouth Disease, Rinderpest, and Newcastle Disease are significant viral diseases affecting livestock.
- Recognizing the type of pathogen (bacteria vs. virus) is essential for diagnosis and treatment in agricultural science.