But on the fourth day, he said, he was “surprised and disappointed” to see that he had tested positive again, and he suffered a recurrence of symptoms, he said, that were worse than before, including a low fever, achiness, a runny nose and a “mild cough.” He called his doctorContinue Reading

On Tuesday, doctors, nurses and health workers across the United States began to give Covid-19 vaccinations to children 6 months to 5 years old, the final group of Americans to gain access to the shots. It was a milestone in the coronavirus pandemic, 18 long months after adults first beganContinue Reading

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

Federal health officials are poised to take the final steps on Saturday to clear the Moderna and Pfizer-BioNTech coronavirus vaccines for very young children —  the only age group in the United States that does not yet have a vaccine option available. If the two vaccines are cleared, as expected,Continue Reading

The White House has outlined the early stages of its plan for making coronavirus vaccines available this month to roughly 18 million children younger than 5, the last group of Americans yet to be eligible for the shots. The Biden administration has made 10 million doses available to states andContinue Reading

Roughly 17 million Americans received the Johnson & Johnson Covid vaccine, only to be told later that it was the least protective of the options available in the United States. But new data suggest that the vaccine is now preventing infections, hospitalizations and deaths at least as well as theContinue Reading

British children aged 5 to 11, one of the last remaining groups in the country still broadly ineligible for the coronavirus vaccine, will be offered doses under new guidance announced on Wednesday by Britain’s independent vaccine advisory committee. Sajid Javid, England’s health secretary, said in a statement that the NationalContinue Reading

The World Health Organization, which has been resistant to endorse the wide use of booster shots and slow in recommending vaccinations for children, moved on Friday to revise its advice on both fronts, bringing its guidance closer to that of most wealthy nations, including the United States. An advisory panelContinue Reading

JERUSALEM — Preliminary results from a small Israeli study examining the effects of a fourth coronavirus vaccine dose suggest that despite an increase in antibody levels, the additional dose a few months after a third shot may not do much more to prevent infection with the Omicron variant. Prof. GiliContinue Reading

The Centers for Disease Control and Prevention recommended on Tuesday that Americans who received two doses of the Pfizer-BioNTech coronavirus vaccine seek a booster shot five months after the second shot, and not wait six months, as earlier guidance had said. The agency also recommended that some immunocompromised children agesContinue Reading