A new real-world study finds fewer side effects after vaccination with the Pfizer/BioNTech and the AstraZeneca/Oxford COVID-19 vaccines than reported in phase 3 clinical trials, while another paper notes some instances of facial paralysis after receipt of the Pfizer or Moderna vaccine but no increased risk.Mild systemic side effects in 1 of 4In the first study, King's College London and other UK and US researchers mined data from the 627,383 users of the ZOE COVID Symptom Study app, who self-reported systemic and local side effects within 8 days of the receipt of one or two doses of the Pfizer vaccine or one dose of the AstraZeneca vaccine from Dec 8, 2020, to Mar 10, 2021.