Moderna's closely watched early-stage human trial for a coronavirus vaccine produced Covid-19 antibodies in all 45 participants, the biotech company announced Monday, sending the company's shares surging more than 17%. Each participant received a 25, 100 or 250 microgram dose, with 15 people in each dose group.Participants received two doses of the potential vaccine via intramuscular injection in the upper arm approximately 28 days apart. At day 43, or two weeks following the second dose, levels of binding antibodies in ...