What are the chances of an American vaccine?

US President Donald Trump has been pushing hard for an American vaccine against Covid-19. He's named the program Operation Warp Speed, which has many people worried that safety tests will be rushed. What are the prospects for an American vaccine against Covid-19? If the US is first, will it make its vaccines available to other countries? And what if it's not first? Three American vaccine experts talk with the BMJ about prospects for an American vaccine against the new coronavirus. Joining us are; Nicole Lurrie - senior lecturer at Harvard Medical School and a strategic adviser to the foundation working on global vaccines, CEPI. Paul Offit - professor at the University of Pennsylvania, and co inventor of a rotavirus vaccine. Prashant Yadav - senior fellow at the Centre for Global Development and a lecturer at Harvard Medical School.