When is a tetanus shot not a first aid?

A tetanus shot is not considered first aid when it is administered as part of routine immunization or booster schedules, rather than in response to a specific injury. Additionally, it is not immediate first aid for a wound; it is a preventive measure taken to protect against tetanus infection, which may be required if a wound is deep or contaminated. First aid focuses on immediate care for injuries, whereas a tetanus shot is a preventative healthcare measure.