백신 안맞는 이유(음모론 제외, 팩트와 과학만 나열)

Vaccine prevent infection.

I got 3 covid and 1 flu shot.

But, I got flu this week and take Nyquil now.

Why?

Flu vaccine is effective against 15% of all flu.

I take covid test every week.

It has been negative for 2 years thanks to vaccine.