Fauci delivered the somber warning Tuesday to the Senate Committee on Health, Education, Labor and Pensions during a hearing about the road to reopening businesses across the nation. U.S. officials have pointed to the development of a vaccine as a key turning point in the Covid-19 pandemic, even though it will take a at least 12 to 18 months. As experimental vaccines are created, they will also need to be mass produced to be administered to the more than 7.6 billion people around the world. In the meantime, there are not yet proven treatments for virus. Fauci’s comments highlight another...