Pfizer and Moderna have refused to divulge details of how to make their cutting-edge COVID shots. Here's what two scientists — and longtime best friends — are doing about it.

There's serious concern about the effectiveness of vaccines against the omicron strain. But there's also reason to be hopeful — especially for those who've had a booster.

It's the first step in an audacious plan to solve vaccine inequity by setting up the manufacturing of mRNA vaccines across low-resource countries,

That's how some scientists describe the findings of a series of studies looking at the antibodies created by individuals who were infected by the coronavirus and then had an mRNA vaccine.

An open letter from 175 experts to President Biden made the ask. "We're not trying to be unreasonable," explains Dr. Paul Farmer, one of the signers. "We're trying to be optimistic and audacious."

Health officials are investigating reports of mostly mild, temporary and treatable heart inflammation that may or may not be causally linked to vaccination with an mRNA vaccine against COVID-19.