influenza vaccination; flu shot
Refers to the act of getting vaccinated against influenza or the vaccine itself. Common in medical and everyday contexts.
I got a flu shot again this year.
I make an appointment for an influenza vaccination.
ワクチン is a general term for 'vaccine', while インフルエンザ予防接種 specifically means 'influenza vaccination'.
予防接種 is a broader term for 'vaccination' or 'immunization', not limited to influenza.
Compound of インフルエンザ (influenza, from English) + 予防接種 (vaccination).