A vial of Regeneron monoclonal antibody sits on a medical table as registered nurse Jessica Krumwiede attempts to find a vein to administer it to Cathy Hardin, who was vaccinated prior to testing positive for the coronavirus disease (COVID-19), at the Sarasota Memorial Urgent Care Center in Sarasota, Florida, U.S., September 23, 2021. REUTERS/Shannon Stapleton