LONDON — People who have been infected with Covid-19 are likely to have some form of immunity for at least five months, according to early results of a major new study in the U. K. Preliminary findings in Public Health…

Dr. Anthony Fauci on Sunday defended raising the bar on his projections about herd immunity for COVID-19 — insisting that he’s only been offering “estimates” all along.“We have to realize that we have to be humble and realize what we…

Dr. Sean Conley, the President’s physician, released a note on Friday afternoon that the President had completed an infusion of 8 grams of Regeneron’s experimental polyclonal antibody treatment as a “precautionary measure” after his diagnosis of Covid-19 late last night.“As…

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…