What Getting The Flu Vaccine Every Year Does To Your Immunity
Getting a flu vaccine is like wearing underwear. Just because you did it last year, doesn't mean you shouldn't do it this year.
Also, similar to underwear, the protection offered by a flu vaccine does not last forever. While the duration of protection can vary significantly from person to person, in some cases, the protection may wear off in 6 months or so, which is still much longer than you should wear a pair of underwear. That's one reason why you should get a flu vaccine every year, assuming that you are 6 months and older because you can read this and you don't have a medical reason (e.g., life threatening allergy) to not get the vaccine.
Another reason is that strains of the flu virus are like reality television stars. Different ones come and go from year to year. Therefore, the strains in a flu vaccine and thus the strains that you end up being protected against vary from year to year.
インフルエンザワクチン接種は毎年するべきか？答えはイエス。
理由１ 効果は６ヶ月位でなくなる
理由２ 違うタイプのものが毎年流行する
If you want to maximize your immunity against the flu, you have to get the vaccine each and every year.