Brace yourself: Flu season is around the corner.

Soon, subways, schools and offices will be filled with sniffling, sneezing and wheezing as the dreaded virus makes its sickening comeback.

Want to avoid becoming one of them? Dr. Bruce Hirsch , an infectious disease specialist at Northwell Health, revealed the top five mistakes Americans make when getting the flu shot — and shared one surprising trick to supercharge your immunity. 3

Mistake No. 1: Getting jabbed too soon

“The protection from the flu shot is best in the first two months after vaccination, but then it decreases,” Hirsch told The Post.

So while getting it early might make you feel like an overachiever, you could be leaving yourself with slightly diminished immunity at the peak of flu season.

Mistake No. 2: Wait

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