question: SINCE I TOOK THE VACINNE ABOUT THREE WEEKS AGO I HAVE HAD A SERIOUS  MUCUS LUNG INFECTION WITH A DEEP COUGH AND PERODIAC SORE  THROAT WITCH LASTS  FOUR TO FIVE DAYS, GOES AWAY AND  RETRNS A WEEK LATER. I AM ON MY FOURTH BOUT NOW. HOW SERIOUS DO YOU THINK THIS COULD BE ?