The New York Times: Most Americans have been infected with the coronavirus at least once, the C.D.C. says.. >"Blood tests showed a sharp increase in the proportion of people — especially children and adolescents — in the United States who had antibodies indicating past exposure to the virus, the agency said."

40%? It's almost half of the population! Then why is't it compulsory to wear a mask in public places if people are so "fragile "?