omicron January 25, 2022 6:44 am Pfizer Testing Vaccine Targeting Omicron Pfizer announced Tuesday it has launched a clinical trial to test an updated COVID-19 vaccine that targets the omicron variant. 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