My military husband had his recommended (obligatory) yearly flu vaccination for many years, until he noted that he came down with the flu every year. He hasn’t had a flu shot for many years and has never come down with the flu. For that matter, neither have I.
I doubt that I have ever had the flu, I wouldn’t even know how to tell if I had it.
I don't think the flu shot actually causes flu, but what may have happened to your husband is that the shot weakened his immunity and allowed him to catch a strain of the virus that was either not included in that shot, or which he had never been exposed to before. He can be thankful it was only flu.
He hasnt had a flu shot for many years
Ditto here. I have been exposed to confirmed cases at least a hundred times these last two years. Maybe I had a good case of that pandemic 68 flu, the year I was born. Who knows.. I do know, no one starts getting the flu until people get vaccinated. Every year, as predictable as a democrat raising taxes.. first the vax, then next thing you know we are all going to die of the flu. Full disclosure, I wash with soap and water after any exposure.