During flu season, I write a lot of articles promoting the flu vaccine. Why? Because it is the best way to avoid getting the flu.
I also talk to a lot of people about the flu vaccine and why they are (or are not) getting one. Inevitably, I hear that the flu vaccine is "terrible this year" or "doesn't even work." And, although that is not true, the flu vaccine certainly could be better.
Vaccines kick-start the body to make protective antibodies specific to the bacteria or virus of choice. For example, the MMR vaccine tells the body to make antibodies to measles, mumps and rubella and the flu vaccine tells the body to make antibodies against the flu.
These protective antibodies are of the IgG class of antibodies. There are five major classes of antibodies, IgA,...