Home Coronavirus COVID-19 Study: Effectiveness of Pfizer and Moderna Vaccines Falls to 66% with Delta... Study: Effectiveness of Pfizer and Moderna Vaccines Falls to 66% with Delta Variant August 25, 2021 You are unauthorized to view this page. Username or E-mail Password Remember Me Forgot Password RELATED ARTICLESMORE FROM AUTHOR Canada Issues New Travel Advisory for Mexico Gen Z Activists Plan New March in Mexico City Protesters Rally Outside the White House in Anti-Trump Demonstration VIDEOS: Young Mexicans Lead Fierce Protests in Mexico City Buen Fin, Mexico’s Annual Shopping Bonanza, Kicks Off Nationwide