Pfizer and BioNTech have begun a clinical trial for their Omicron-specific Covid-19 vaccine
Pfizer and BioNTech have begun a clinical trial for their Omicron-specific Covid-19 vaccine candidate https://t.co/v9i8vKHGFM — CNN Breaking News (@cnnbrk) January 25, 2022 https://platform.twitter.com/widgets.js