Side effects from the COVID-19 vaccines -- such as soreness and fever -- are quite common, but the more serious complications are among the top reasons why many may still be hesitant to get vaccinated.Now that hundreds of millions of people have gotten the shots, the FDA and CDC -- through their Vaccine Adverse Event Reporting System (VAERS) -- are getting a clearer picture of how frequently more serious side effects occur.On this week's episode, Peter Marks, MD, director of the FDA's Center for Biologics Evaluation and Research, joins us to offer insights into the data on adverse events and the questions that still remain.