Wading into an acrimonious debate over booster doses, researchers in Israel reported on Wednesday that a third dose of the Pfizer-BioNTech coronavirus vaccine can prevent both infections and severe illness in adults older than 60 for at least 12 days. The study, published in the New England Journal of Medicine,Continue Reading

Coronavirus infections surged in South Africa in recent months despite research suggesting that about 98 percent of the population had some antibodies from vaccination, previous infection, or both. The study, released Thursday but not yet peer reviewed, analyzed the prevalence of two types of antibodies in 3,395 blood donors collectedContinue Reading

For a world weary of fighting the coronavirus, the monkeypox outbreak poses a key question: Am I at risk? The answer is reassuring. Most children and adults with healthy immune systems are likely to dodge severe illness, experts said in interviews. But there are two high-risk groups. One comprises infantsContinue Reading

But determining when, and in whom, the mutations first appeared requires many more virus samples from farm workers, local residents and mink, collected before and after the outbreak. “That data doesn’t exist,” said Arinjay Banerjee, a virologist at the University of Saskatchewan. Throughout 2020, testing was difficult for Americans toContinue Reading

Researchers also assessed the user-friendliness of each product. “You want to make sure that nothing requires too much force, make sure that it’s easy to grasp, grip,” said Sarah Farmer, managing director of Georgia Tech’s HomeLab. “Let’s streamline it where possible, cut down steps where possible.” Maxim Biomedical, a Maryland-basedContinue Reading

HYDERABAD, India — On the outskirts of this centuries-old Indian city, a world away from its congested roads and cacophony, the gleaming modern laboratories of Bharat Biotech are churning out a Covid vaccine that would be sprayed into the nose rather than injected into the blood. Currently available vaccines produceContinue Reading

“You have to start somewhere,” said Kathrin U. Jansen, a senior vice president and the head of vaccine research and development at Pfizer, while awaiting the results of more complex studies and “real-world evidence that tells you what we need to know.” Scientists say it could take a month orContinue Reading

What is the Omicron variant? First identified in Botswana and South Africa, this new iteration of the coronavirus has prompted concern among scientists and public health officials because of an unusually high number of mutations that have the potential to make the virus more transmissible and less susceptible to existingContinue Reading

Scientific experts at the World Health Organization warned on Friday that a new coronavirus variant discovered in southern Africa was a “variant of concern,” the most serious category the agency uses for such tracking. The designation, announced after an emergency meeting of the health body, is reserved for dangerous variantsContinue Reading

The Food and Drug Administration seems likely to allow Americans to switch vaccines when choosing a Covid-19 booster shot. That authorization, which could come this week, is the latest development in a long-running debate over whether a mix-and-match strategy helps protect people from the coronavirus. Here are answers to someContinue Reading