The tetanus shot is a type of vaccine primarily used to prevent infection by the tetanus bacterium. Tetanus bacteria are anaerobic and can typically be found on rusty nails, rusty blades, and other objects that cause cuts. In such cases, an intramuscular injection of tetanus antitoxin is needed to prevent infection by the tetanus bacterium. Although the chances of contracting tetanus are relatively low, the mortality rate is quite high if one does get infected. Therefore, it is crucial to take it seriously to avoid severe adverse consequences.