that one year i got the flu shot, even after i got over the flu like symptoms of the flu, i had a cough that lingered for about a month. it was so bad, that my wife at the time made me sleep on the couch because my coughing was keeping her awake at night! i kept going back to the doctor, and they kept trying different prescription cough medicines to clear up the cough, but nothing was really working for long. finally, he gave me a prescription for some little clear looking gel type capsules. i don't even remember what they were now, but they cleared up that cough in just a few days.