Then you were very unlucky in that you caught a different flu than the strains you were vaccinated against - there are 3-4 strains in a typical shot, but many m

Then you were very unlucky in that you caught a different flu than the strains you were vaccinated against - there are 3-4 strains in a typical shot, but many more can come up during the flu season. Alternativey, you didn't have a real flu but a bad cold, which can be quite nasty in some cases.