coronavirus June 14, 2021 6:57 am Novavax Says Its Vaccine Has 90.4% Efficacy Novavax announced Monday that its COVID-19 vaccine had a 90.4% efficacy in a phase 3 trial in the U.S. and Mexico. US & World Videos 2:33 CDPH releases updated Covid-19 isolation guidelines 1:31 CDC recommends updated Covid shot for everyone ages 6 months and up 2:17 San Diego and California's COVID-19 Emergency Declarations Are Expiring. Here's What That Means 2:30 San Diego and California COVID-19 Emergency Declarations Expire Tuesday 3:26 COVID, Flu Cases Down Slightly; Doctors Urge Caution