One dose of Pfizer or Moderna vaccines was 80% effective in preventing Covid in CDC study of health workers

One dose of Pfizer or Moderna vaccines was 80% effective in preventing Covid in CDC study of health workers This is a developing news story. Please check back for updates: https://www.cnbc.com/2021/03/29/cdc-study-shows-single-dose-of-pfizer-or-moderna-covid-vaccines-was-80percent-effective.html Follow @CNBCnow for breaking news and real-time market updates Unsubscribe Manage Newsletters Terms of Service Join the CNBC Panel   Digital Products Feedback Privacy Policy CNBC Events   © 2021 CNBC LLC. All rights reserved. A property of NBCUniversal. 900 Sylvan Avenue, Englewood Cliffs, NJ 07632 Data is a real-time snapshot *Data is delayed at least 15 minutes. Global Business and Financial News, Stock Quotes and Market Data and Analysis. Data also provided by THOMSON REUTERS