World Jan 9, 2022

Will ‘forever boosting’ beat the coronavirus?

Everyone should get a booster shot. In the long run, though, doses every few months aren’t a viable public health strategy, scientists say.

World Nov 29, 2021

Will the vaccines stop omicron? Scientists are racing to find out.

A “Frankenstein mix” of mutations raises concerns, but the variant may remain vulnerable to current vaccines. If not, revisions will be necessary.

World / Science & Health Nov 2, 2021

How often do COVID-19 vaccines cause heart problems in kids?

While the vaccines made by Pfizer-BioNTech and Moderna do seem to be associated with an increased risk of myocarditis, the absolute risk remains very small.

World / Science & Health Aug 18, 2021

In a handful of U.S. states, early data hint at a rise in breakthrough infections

With the arrival of the contagious delta variant, COVID-19 hospitalizations and deaths among vaccinated Americans also may have increased, according to preliminary figures.

World Jul 9, 2021

How does the delta variant dodge the immune system? Scientists find clues.

The variant, first identified in India, is believed to be about 60% more contagious than alpha, the version of the virus that thrashed Britain and much of Europe earlier this year.

World Jun 28, 2021

Pfizer and Moderna vaccines likely produce long-lasting immunity

The findings add to growing evidence that most people immunized with mRNA vaccines may not need boosters, so long as the virus and its variants do not evolve much.

World / Science & Health May 27, 2021

Immunity to the coronavirus may persist for years, scientists find

The findings may help put to rest lingering fears that protection against the virus will be short-lived.

World May 4, 2021

Reaching ‘herd immunity’ is unlikely in the U.S., experts now believe

New variants and persistent hesitancy about vaccines will keep the goal out of reach. The virus is here to stay, but vaccinating the most vulnerable may be enough to restore normalcy.

World Feb 20, 2021

People who have had COVID-19 should get single vaccine dose, studies suggest

New studies show that one shot of a vaccine can greatly amplify antibody levels in those who have recovered from the coronavirus.

World Jan 26, 2021

As virus grows stealthier, vaccine makers reconsider battle plans

As the coronavirus assumes contagious new forms around the world, two drugmakers reported on Monday that their vaccines, while still effective, offer less protection against one variant and began revising plans to turn back an evolving pathogen that has killed more than 2 million ...