Moderna (MRNA) Down as Pfizer Paxlovid EUA May Fuel Competition Posted byZacks Equity Research December 23, 2021 Leave a comment on Moderna (MRNA) Down as Pfizer Paxlovid EUA May Fuel Competition Moderna’s (MRNA) COVID-19 vaccine may face stiffer competition following the FDA’s emergency approval of an oral COVID-19 pill, Pfizer’s Paxlovid, which may result in lower sales.