(Rochester, MN)  — A Mayo Clinic expert maintains his support of COVID-19 vaccine use despite experiencing a side effect.  Dr. Gregory Poland says he has suffered severe ear-ringing since about 90 minutes after he received his second vaccine dose last year.  Poland is the director of Mayo’s Vaccine Research Group and says the evidence shows that the risks of having COVID-19 far outweigh the risks associated with the vaccines.  New data suggests that tinnitus is a rare side effect from vaccination.