For what it is worth
First of all we will be getting a flu shot.
As we all know, flu is a virus so it rapidly changes. Invariably, after we take the shot they report OOPS, the current vaccine is only ///% effective. You should get a sheet as to what they delivered. I'm not certain if they all deliver the same shot or if you can look for a particular one.
If, I recall, it takes four weeks after the shot to develop as much immunity as you will get from the shot and then it does fall off-the reason why if you decide to get a flu shot you need to get it every year.
Today, we have far better medical car and we are not living in trenches BUT, more people died from the flu in WWI then died from all combat injuries.
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