Hi Loretta,
I don't know, I think that question will always remain as such, a question! At least for awhile.
One school of thought would dictate that if your immune system is compromised, then your odds ratio goes up for dire complications should you have to endure an aggressive flu. As with any flu, those whose immune systems cannot deal with that kind of confrontation, have problems so a flu shot proactively makes sense.
On the other hand, I remember comments from a PhD physiologist instructor back in the day, who felt that flu shots had two edges: they do stimulate your immune system to attack whatever attenuated viruses are in the shot de jour, but at the expense of the activation of a finite number of T-cells that your body can produce in its lifetime. When you run low on T-cells later in life, you are sort of at mercy of all confrontational attacks thereafter and then have no natural defenses available.
Thank God we don't have to take these bodies with us when we go, right?!
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