What is the primary clinical manifestation of tetanus?

• A. High fever
• B. Locked jaw
• C. Severe headache
• D. Coughing

Answer: (B)

The primary clinical manifestation of tetanus is referred to as "locked jaw," which is medically known as trismus. This condition occurs due to the intense muscle spasms caused by the neurotoxin produced by the bacterium Clostridium tetani. The toxin disrupts normal motor neuron signaling, leading to sustained contractions of the muscles, particularly those involving the jaw. This symptom is often one of the earliest signs of tetanus and is indicative of the muscle stiffness and spasms that characterize the disease.

While high fever, severe headache, and coughing may be associated with various other infections or medical conditions, they are not defining features of tetanus. The hallmark of this condition is the muscle rigidity and characteristic locking of the jaw, which emphasizes the nature of tetanus as a neurotoxic infection. Understanding this key symptom is crucial for recognizing and diagnosing tetanus in clinical settings.