I have come down with a nasty "cold" several times right after I have had a flu shot. I'm not sure if it was the flu shot or just bad timing, but it has happened enough times that I no longer get a flu shot.

"Facts are stubborn things; and whatever may be our wishes, our inclinations, or the dictates of our passion, they cannot alter the state of facts and evidence". John Adams

"A dishonest man can always be trusted to be dishonest". Captain Jack Sparrow