I have to disagree with Lulu's answer a little bit. Ideally the flu vaccine should have 2 weeks to develop the maximum amount of protection. You had just about half of that. The steroids, in the doses, used for MS or Probable MS would shut down any further stimulation of protective antibodies. This means you would be left with just the beginning of protection which might or might not actually protect you from infection.
Doctors vary about whether they would just go along with whatever protection you might have developed or whether they would recommend a booster dose in 6 weeks or so. I think most would assume the 8 days would be enough. If nothing else, the low level of antibodies might give you a lighter case.
So there is no perfect answer. It is a gray area. You probably have some protection, but I would still work closely with your doctor to make sure you got treated with antivirals if you had a close exposure or if you started up with symptoms.
This is why we love having Dr. Q in the house to correct our errors. I didn't think of the time it takes for the vaccine to build immunity. Now I know something new - and hope it will stick in my brain.
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