Final answer:
Spasms and stiffness in the jaw, neck, or abdomen is a symptom of tetanus. Tetanus toxin (TeNT) from Clostridium tetani causes muscle contractions due to neurotransmitter inhibition.
Step-by-step explanation:
The correct symptom of tetanus among the provided options is spasms and stiffness in the jaw, neck, or abdomen. Tetanus, caused by the bacterium Clostridium tetani, produces tetanus toxin (TeNT), which can lead to various forms of the disease, such as localized, cephalic, or generalized tetanus. The toxin inhibits the release of neurotransmitters, like gamma aminobutyric acid (GABA), leading to uncontrollable muscle contractions. Early symptoms of tetanus often include lockjaw (inability to open the mouth due to stiffness in the jaw muscles), followed by muscle spasms in other parts of the body. Advanced stages may feature a rigid, stiff arch of the body known as opisthotonos. Tetanus can ultimately result in respiratory failure and death if not treated properly.