LOS ANGELES — Patients with severe COVID-19 disease who develop respiratory failure have malfunctions in their immune systems that distinguish them from other COVID-19 patients, according to a new study led by Cedars-Sinai. The findings could help doctors develop new…

A new study has found evidence of a “robust cellular memory” against Covid-19 that lasts for at least six months after infection, reinvigorating the question of whether natural infection with the virus could grant lasting immunity after a study last…

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…

Two months ago, Moderna trumpeted “positive” early data for its COVID-19 vaccine but didn’t offer the results in a scientific presentation or in a peer-reviewed study. Now, it’s showing us the receipts. The phase 1 study, being run by the…