[kscarrol]

Not a physician but #1, good question! As for #2, while I do get a flu shot every year (partly because my son is a type 1 like UncleWede), I wait until later in the season as they have a better feel for what strain is running rampant and get the adjusted vaccine. #3 There is a nasal mist though I seem to recall hearing it's not as effective in terms of immune system response and therefore effectiveness in preventing flu.

Back to #2, the flu virus is always mutating so the new strain in any given year may be different enough so that the antibodies you have from earlier shots/infections may not protect you.

At the end of the day it's kind of like buying extended warranty on your car. Given that there is no cost for this warranty, I take it.

Edit: And I see Marcus beat to some of my points!