I got a flu shot one time years back and it worked. I had the worst case of flu I ever had in my life. Never got another one. We've had a couple strains of it running around here this winter, both laid people out for a week if they got either one. A neighbor got over one and got the other 2 weeks later. Poor gal was miserable. My wife and I have managed to avoid getting either one and actually haven't had any flu for several years.
That's ashame that your flu shot did not protect you. My hubby also gets his flu shot every year and he actually got the flu last winter even though he had his shot. I have only ever had 1 and it worked wonderfully, I was wroking in an Assisted Living Home and we got the shot for free, to protect ourselves and our elderly and frail residents, I never got even a sniffle that entire year! So I found the shot to be very effective that year!
I have not had the shot since, but have had the flu almost every winter, I have been fighting it off twice this winter with sudafed and antihistamines, and staying out of the wicked weather, getting plenty of sleep and eating right! It is hard to shake once you get it, and last year I had to see the Dr. and be put on antibiotics to get over it. I wish I could get the flu shot every year to avoid it, but it is expensive to see the Dr. around here.
