Your statement clarifies it a bit but it really is saying that any other infection may affect the ability of the inoculation to work to it's fullest potential and that is true.This is what I meant:
"All vaccines put a particular germ (or a part of a germ) into the body, with the goal of stimulating the immune system to recognize it. That recognition allows the immune system to vigorously and promptly attack the germ if it ever enters your body in the future.
If your immune system is busy fighting a major war against, for example, a bacterial infection of your throat (like "strep throat") or your ears at the time you get a vaccination, your immune system may be distracted by the war it is waging, and not recognize the flu vaccine. It is better to wait until the immune system is finished fighting, and has the time and energy to recognize the flu vaccine. That way you increase the chance of the flu shot protecting you against the virus during the flu season."
Anthony Komaroff, M.D., is professor of medicine and editor-in-chief of Harvard Health Publications at Harvard Medical School. Dr. Komaroff also is senior physician and was formerly director of the Division of General Medicine at Brigham and Women's Hospital. Dr. Komaroff has served on various advisory committees to the federal government, and is an elected Fellow of the American Association for the Advancement of Science
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Anyway, I personally don't believe in getting flu shots unless one works in an environment where one is constantly around sick people all day. It is an individual decision and people are free to do as they wish.
My doctor told me a few years ago that if you have any cold, even a whiff of one, that you shouldn't get a seasonal flu shot as you more than likely will catch a cold after getting the shot. I have since your post researched this a bit and find differing online medical opinions as to the validity of this advice. Some soucres agree, many do not. The above quoted example was of the opinion that a mild cold is no reason to avoid a shot, but a more serious seasonal sickness is good reason not to get it. My doctor said he wouldn't give a flu shot to any patient of his who was exhibiting any symptoms of having a cold as he believed they would get worse.
The chance of getting that lingering cold is just that, a chance, but I'd rather have a cold and not the flu.
Your explanation also shows why they ask you before the shot if you have something going on already.