USA needs more effective flu shots, experts say

From what little I know about "herd immunity" it would seem a bare minimum requires 75% efficacy of the vaccine with 100% vaccination.

Since this flu vaccine is only 62% effective, I come to the conclusion that there is no herd immunity effect for flu, even if somehow everyone got the flu shot.

(am willing to be corrected if I am wrong)

What we really need is a more efficient process for producing vaccine once a flu strain has been identified. No more guessing. Observe and react.

USA needs to grow a F concience. (sorry for swearing)