FILE PHOTO: An experimental COVID-19 treatment pill, called molnupiravir and

FILE PHOTO: An experimental COVID-19 treatment pill, called molnupiravir and being developed by Merck & Co Inc and Ridgeback Biotherapeutics LP, is seen in this undated handout photo released by Merck & Co Inc and obtained by Reuters on October 26, 2021. Merck & Co Inc/Handout via REUTERS