By BY SHERYL GAY STOLBERG, SHARON LAFRANIERE, KATIE THOMAS AND MICHAEL D. SHEAR U.S. https://ift.tt/3bXukGu The pharmaceutical giant Merck & Co. agreed to help manufacture Johnson & Johnson’s coronavirus vaccine, in a deal partly brokered by the White House. New York Times Vaccination and Immunization, Drugs (Pharmaceuticals), Coronavirus (2019-nCoV), United States Politics and Government, Defense Production Act, Factories and Manufacturing March 3, 2021 at 12:48AM