I don't particularly like the Flu vaccine because it is based on a best guess about which strains they should choose for the year. Sometimes they have been wrong. Several years ago I was working in dialysis and myself and two other nurses chose not to get the flu shot and everyone else did. Strangely everyone else ended up with a very bad case of flu and we didn't. Just us three were working one day because everyone else was sick. So when it comes to flu it's kind of hit or miss. I only get it when I can get the thimerosol and heavy metal free shot. A lot of homeopathic and functional medicine doctors will have these.
I thought thimerosal was discontinued in 1996, since the advent of single-dose bottles. Also, thimerosal contains ethyl mercury, not methyl mercury, and the ethyl mercury breaks down quickly and is excreted quickly, unlike the other kind. Kinda like the difference between ethyl alcohol and methyl alcohol. Are some vaccines still found in multiple-dose bottles?
I sometimes wonder about the efficacy of the flu vaccine, it is such a crap shoot. I read recently about an antibody found on all flu versions, discovered in 2016...I wonder if a vaccine could be made, based upon that marker...
In late 2018, I got my flu shot, and on New Year's Day, I came down with one if the worst bouts of flu I ever had. When I finally got to the doctor's, I got my nose swabbed and yep, it was type 1 flu. I didn't need a test to tell me that. I caught pneumonia from my sister-in-law, who was visiting, as she suspected she was coming down with pneumonia. I never had it before. After I recovered, I got the Prevenar 13 vaccine!
Vaccine did not help much!