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…

Countries around the world have closed their doors on the UK following the discovery of a new coronavirus variant. The variant—known as “B.1.1.7”—appears to have spread rapidly through London and the south-east of England. Although it appears to be more…

The White House said Friday that President Donald Trump is “fatigued but in good spirits” and shared information about his treatment following his coronavirus diagnosis. Trump’s physician, Dr. Sean Conley, said in a memo shared by White House officials that…

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…

Protection from any potential coronavirus vaccine might be short-lived and could require a booster to prolong protection, White House health advisor Dr. Anthony Fauci said Monday. As several companies move closer to the finish line of a potential vaccine for…