. "Immunization" refers to the use of all vaccines but also extends to the use of antitoxin, which contains preformed antibody to e.g. diphtheria or tetanus exotoxins. "Inoculation" is now more or less synonymous in nontechnical usage with "injection" etc., and the question e.g. 'Have you had your flu injection/vaccination/inoculation/immunization?' should not cause confusion. The focus is on what is being given and why, not the literal meaning of the technique used.