The coronavirus is both a medical problem and a public-health problem – that’s baked into its biology. But the pandemic in the U.S. has been exacerbated by another challenge of our own making: a pervasive atmosphere of distrust. That atmosphere has let misinformation about the virus flourish. That misinformation is often amplified by the man with the country’s loudest megaphone, President Donald Trump. John Tozzi reports that the information crisis has made practicing medicine in a pandemic even more difficult.