A heavily bleeding and bruised road accident victim was brought to a nursing home

A heavily bleeding and bruised road accident victim was brought to a nursing home. The doctor immediately gave him an injection to protect him against a deadly disease.
(i) What did the doctor inject into the patient’s body?
(ii) How do you think this injection would protect the patient against the disease?
(iii) Name the disease against which this injection was given and the kind of immunity it provides.

(i) The doctor must have injected the tetanus vaccine into the patient.
(ii) The vaccine/injection stimulates the body to make antibodies against the tetanus toxin.
(iii) The disease is tetanus caused by bacterium Clostridium tetani. The injection provides passive immunity.