Researchers tested an edible mushroom called Cordyceps militaris to see if it could fight SARS-CoV-2, the virus that causes COVID-19. Using computer modeling and laboratory experiments, they found that a compound in the mushroom called cordycepin strongly attached to the virus’s spike protein and reduced viral numbers by about 50% in cell cultures. The study supports traditional uses of this mushroom and suggests it could be helpful in managing COVID-19 as the disease becomes endemic.