A new formulation entering clinical trials in Brazil, Mexico, Thailand and Vietnam could change how the world fights the pandemic. By Carl Zimmer A new…
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Plan to Ditch the Mask After Vaccination? Not So Fast.
It’s not clear how easily vaccinated people may spread the virus, but the answer to that question is coming soon. Until then, scientists urge caution.…
How Merck, a Vaccine Titan, Lost the Covid Race
From Ebola to H.I.V. to river blindness, the American pharmaceutical giant Merck has been on the front lines of the biggest public health emergencies in…
New Pfizer Results: Coronavirus Vaccine Is Safe and 95% Effective
The drug maker Pfizer said on Wednesday that its coronavirus vaccine was 95 percent effective and had no serious side effects — the first set…
The Vaccines Will Probably Work. Making Them Fast Will Be the Hard Part.
The promising news that not just one but two coronavirus vaccines were more than 90 percent effective in early results has buoyed hopes that an…
Regeneron Asks F.D.A. for Emergency Approval for Drug That Trump Claimed Cured Him
The company said that doses of the unproven treatment would be available for 50,000 patients. It’s impossible to know whether it helped the president. By…
AstraZeneca Partly Resumes Coronavirus Vaccine Trial After Halting It for Safety
The company said tests of its vaccine would start up again in Britain while remaining suspended in the U.S. and other countries. Pfizer, a competitor,…