Many people may experience some minor side effects, like arm soreness, which can be a sign your immune system is working with the vaccine.
Many people may experience some minor side effects, like arm soreness, which can be a sign your immune system is working with the vaccine.
Dr. Paul Offit explains why COVID-19 vaccines would not be expected to cause long-term side effects. For information about COVID-19, visit For information about vaccines and vaccine safety, visit