Clinical allergist answers key questions about vaccine

• 4 years ago
• News
• Duration 7:29

Dr. Zainab Abdurrahman, a clinical immunologist and allergist, says only one ingredient in the Pfizer-BioNTech COVID-19 vaccine has been known to cause allergic reactions in the past. And the ingredient, polyethylene glycol, is already widely used. The other ingredients are not known to cause allergy.