What is the common name for Tetanus?

Tetanus is commonly referred to as Lockjaw because one of the hallmark symptoms of the disease is the severe muscle stiffness and spasms, particularly in the jaw muscles. This condition can cause the jaw to become rigid, making it difficult for the affected animal to open its mouth, hence the name "Lockjaw."

This association with muscle stiffness not only emphasizes the significant impact on the jaw but also highlights the neurological aspect of the disease, which is related to the toxin produced by the bacterium Clostridium tetani. The other options describe different diseases that affect livestock but do not relate to the symptoms or characteristics associated with tetanus. For instance, Blue Tongue is a viral disease affecting sheep, Blackleg is a bacterial disease caused by Clostridium chauvoei, and White Muscle Disease, also known as Nutritional Muscular Dystrophy, results from vitamin deficiency and primarily affects the skeletal muscles. Thus, Lockjaw as the common name for Tetanus is strongly anchored in the clinical presentation associated with the disease.