Pfizer and BioNTech launch trial of Omicron-targeted Covid vaccine in US
Companies to test fourth dose of current vaccine against fourth dose of new one
Covid vaccine gets green light from US FDA advisory panel
Regulator set to approve Pfizer/BioNTech vaccine within days
Pfizer-BioNTech and Moderna begin late-stage Covid-19 vaccine trials
Companies expect approvals as early as October if vaccines deliver on early promise
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