Here Are All the Companies Working on COVID-19 Vaccines, Treatments, and Testing Post date April 16, 2020 ← Johnson & Johnson Announces a Lead Vaccine Candidate for COVID-19; Landmark New Partnership with U.S. Department of Health & Human Services; and Commitment to Supply One Billion Vaccines Worldwide for Emergency Pandemic Use → A coronavirus vaccine could be ready by September, according to a British scientist who is developing one