A coronavirus vaccine the University of Oxford is developing with AstraZeneca Plc showed promising results in early human testing, which is a sign of progress in the high-stakes pursuit of a shot to defeat the pathogen. The vaccine increased levels…

Moderna’s Covid-19 vaccine led patients to produce antibodies that can neutralize the novel coronavirus that causes the disease, though it caused minor side effects in many patients, according to the first published data from an early-stage trial of the experimental…