A car waits at a traffic light with a large model of the influenza virus on its roof, in Medford
A car, advertising for Quidel Corp., which makes test kits for both the flu and the coronavirus disease (COVID-19), waits at a traffic light with a large model of the influenza virus on its roof, in Medford, Massachusetts, U.S., March 31, 2021. REUTERS/Brian Snyder