New studies show that one shot of a vaccine can greatly amplify antibody levels in those who have recovered from the coronavirus.
When the United States completes its campaign to immunize every eligible American against the coronavirus, about a quarter of the population will remain unvaccinated. So, what happens to children?
After quickly approving a vaccine and getting an early start to inoculations, Canadians worry as the country falls behind in vaccinations.
Pfizer and Moderna are testing their vaccines on children 12 and older and hope to have results by the summer.
Immunizing teenagers is a critical part of slowing the pandemic and reaching herd immunity. But enrolling them in clinical trials poses challenges that are very different than wrangling adults.
A health journalist is getting a front-row seat to one of the most-anticipated pediatric trials in history.
Prosecutors said the men created a fake duplicate of the Moderna website to fraudulently sell doses of the vaccine, which they never had.
Federal regulators are in favor of a simple, potentially quick fix to bolster coronavirus vaccine supplies: more doses per bottle.
Ten doses of the Covid-19 vaccine would expire within hours, so a Houston doctor gave it to people with medical conditions, including his wife. What followed was “the lowest moment in my life,” Dr. Hasan Gokal said.
Russian news outlets with connections to the Kremlin ran disingenuous Spanish-language stories targeting vaccines made in the United States and Europe, researchers said.
They, too, work, and they can help fill shortages everywhere.
New data from several vaccine trials offer positive signs, but many public health experts say emerging variants mean the next few months will be a race against the virus.
Infectious disease doctors say getting a shot of the J&J vaccine, which has a lower efficacy against the virus than other vaccines, would still be well worthwhile.
Forget boosters and more trials. America’s overly prudent vaccination strategy is killing people.
The W.H.O. and the C.D.C. provide differing views, and experts partly blame a lack of data because expectant mothers have been excluded from clinical trials.
Multibillion-dollar contracts give drug makers liability shields, patent ownership and leeway on delivery dates and pricing — and promises that much of it will not be made public.
Public health workers in Josephine County, Ore., said they had walked from car to car, giving shots to drivers with vaccine doses that would expire in six hours.
An emergency worker in Florida forged vaccine screening and consent forms for missing vaccines to cover up their theft, the authorities said.
President Biden said the amount of coronavirus vaccines reaching the states would rise next week and a deal was near to provide enough shots to vaccinate nearly all Americans by the end of summer.
President Biden now says he hopes to administer 1.5 million coronavirus vaccinations a day, a 50 percent increase from his initial target, and he extended and expanded virus-driven travel bans.
The administration’s vaccine plan isn’t ambitious enough.
Delays, inconsistent data, spotty disclosures and the country’s attacks on Western rivals have marred its ambitious effort to portray itself as a leader in global health.
Vaccines by Moderna and Pfizer-BioNTech effectively protect recipients. But in a worrying sign, they are slightly less effective against a variant found in South Africa.
Can President Biden really boost production? Why are governors trying to buy directly from Pfizer? And when will supply exceed demand?
Laboratory studies of mutations circulating in South Africa suggest they may dodge some of the body’s immune responses.
Israel imposed a tighter lockdown as coronavirus infections soared, the variant spread, vaccines were running out and a debate erupted over the country’s responsibility to the Palestinians.
The N.I.H. and Moderna are examining whether doses of Moderna’s coronavirus vaccine can be halved to double the supply, while scientists look for other ways to extend availability.
Badly hit by the coronavirus, Israel has distributed the first of two vaccine doses to more than 10 percent of its population. Prime Minister Netanyahu is leading the charge, bolstering his own battered image along the way.
Reports of Covid-19 cases that appeared shortly after a single shot of a two-dose vaccine shouldn’t cause concern.
This year, technology firms big and small stepped up to help with the Covid-19 pandemic and other thorny challenges.
Here is what some of the first Americans to be vaccinated against Covid-19 are saying about how they felt afterward, with some side effects but no second thoughts.
Polls show that pervasive skepticism is melting, partly because of the high efficacy rates in trials and the images of real people getting the shot.
The patient, who has a severe shellfish allergy, recovered quickly with treatment. Until now, reports of severe reactions had been linked to the Pfizer vaccine.
The company agreed to deliver the additional doses of its coronavirus vaccine by the end of July, helping address a looming shortage.
There are already signs that the rollout will be messy, confusing and chaotic.
The company could provide at least tens of millions of additional doses of a coronavirus vaccine under an agreement that would give it better access to the supplies it needs to expand manufacturing.
The start of a mass coronavirus vaccination campaign at U.S. nursing homes has brought hope to many families. But it may be a while before restrictions loosen. Here are answers to common questions.
The recommendation was a compromise aimed at getting the coronavirus vaccine to the most vulnerable of two high-risk groups.
The Food and Drug Administration authorized a second coronavirus vaccine for emergency use, clearing the way for millions more Americans to be immunized next week.
A division of the Immigrations and Customs Enforcement agency, working with the Justice Department, is hunting down websites offering fraudulent deals to buy coronavirus vaccines.
A deep distrust of the government is fueling vaccine hesitancy among Republicans, who are more likely than Democrats to resist being inoculated against Covid-19.
Vaccines are rolling out to health workers now and will reach the arms of the rest of us by spring. Here’s what you need to know.
An advisory group’s recommendation will mean millions more Americans can be inoculated, extending protection against Covid beyond major urban areas into rural and suburban regions.
Heroic work went into the development of the coronavirus vaccines. But that doesn’t mean this industry deserves your affection.
Walgreens and CVS staff will soon begin vaccinations at tens of thousands of long-term care facilities. Some staff and residents are wary, and there are thorny issues of consent.
The positive review likely ensures that the F.D.A. will grant emergency authorization for a second coronavirus vaccine this week for millions of Americans.
The two leading coronavirus vaccines seemed to work well in elderly trial volunteers. “I just can’t understand why people are afraid,” one 95-year-old said.
Within days, all three countries could be giving the Pfizer-BioNTech vaccine, but they have varying strategies and challenges. The U.S. plan, working through the states, is the least centralized.
The new vaccines will probably prevent you from getting sick with Covid. No one knows yet whether they will keep you from spreading the virus to others — but that information is coming.
Britain left hospitals short of masks and gowns, and stumbled on testing and tracing, so can it vaccinate tens of millions of people in a matter of months? Experts think it can.