Johnson & Johnson said on Monday it made a $1 billion deal with the U.S. government to create enough manufacturing capacity for more than 1 billion doses of a vaccine it is testing to fight the new coronavirus that has killed more than 34,000 people around the world. Johnson and Johnson said that it had selected its own lead vaccine candidate and would start human testing of its experimental coronavirus vaccine by September, with an eye on having it ready for emergency use in early 2021, the drugmaker said on Monday. J&J said that the first batches of a vaccine...