Test positivity rate: How this one figure explains that the US isn't doing enough testing yet

The U.S. has performed more coronavirus tests than any other country in the world. Yet, at the same time, the U.S. is notably underperforming in terms of suppressing COVID-19. Confirmed cases—as well as deaths—are surging in many parts of the country. Some people have argued that the increase in cases is solely due to increased testing.