The vaccine is effective for 100% of Influenza A strains and only 69% of the Influenza B strains.
We have had about 80 cases of confirmed flu A.. We are being told at least three quarters of our positives had the flu shot. Of course, we are relying on mostly on patient’s recollection of the flu shot. However, I seriously doubt all of those who say they got the shot were wrong. Never had the flu shot.. never will. I had a upper resp virus which was confirmed to be Non fluA and Non flu B.. of course even with the test everyone insisted I had the flu. Someone left the lab door open again and this time, not in Mexico. As a lab rat I hafta say... oops.