Pfizer January 25, 2022 9:44 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 1:39 Lawrence police cracking down on illegal dirt bikes 1:31 CDC recommends updated Covid shot for everyone ages 6 months and up 2:30 Putting an increase in COVID cases into context 1:41 COVID cluster prompts masking at Beth Israel Deaconess Medical Center 0:50 COVID cluster at hospital prompts return of mask requirement in affected unit