Moderna is developing booster shot for new coronavirus variants, increases vaccine production target 25 Feb 2021 - 0:22 Walmart pharmacist Carmine Pascarella holds a vial of the Moderna coronavirus disease (COVID-19) vaccine inside a Walmart department store as Walmart and other major U.S. pharmacies take part in the Federal Retail Pharmacy Program, to increase vaccinations in the U.S. in West Haven, Connecticut, U.S., February 17, 2021. REUTERS/Mike Segar Reuters Moderna Inc said on Wednesday it is working with U.S. government scientists to study an experimental booster shot that targets a concerning new variant of the coronavirus and has raised its global COVID-19 vaccine production goal for this year by 100 million doses.