High-potency Fluadquad injection review for flu prevention - Parents' colds are over!

Have you heard of Fluadquad?
It is a type of flu shot, and it is said to be a high-dose shot recommended for seniors over 65 years of age with weak immune systems.
Not many hospitals carry it. Even doctors say it's free for anyone over 65, unless they know someone who does, so no matter how good it is, who would pay for it? So, you have to ask each hospital if it's available and check the price. It can range from 50,000 to 100,000 won per shot. My parents got it last year and rarely catch a cold, so I went back to the same hospital this year and got it again.