Like most medications vaccinations affect everybody differently because we are all individuals. Although it is recommended that I have a flu jab every year and it is laid on free by our occupational health department, I have never had one. Some of my colleagues have had them and been fine. One colleague had one last year and was off sick for a week with a cold and flu like symptoms. This may have been a side effect for her but it may have been purely coincidental in that she was coming down with something before having the jab. There is no way of knowing which it was.
I am not recommended to have the jab because of medical reasons, if I was, I would probably have it. It is purely a recommendation because of my job and the large amount of people that I come into close contact with. The contact I have with people is very intimate and I have been vaccinated against Hep B but I rarely care for people with flu (although many people with a bad cold reckon they have the flu)..

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Never put off until tomorrow what you can avoid altogether.
The views expressed here are my own and not necessarily those of my family, friends, employer, this site, my neighbours, hairdresser, dentist, GP, next door's dog or anyone else who knows me..