coronavirus July 7, 2021 10:51 am ‘Hypertransmissable' Delta Variant Now Leading Coronavirus Strain in US The latest CDC data shows that the Delta variant is now the dominant coronavirus strain in the U.S. 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