Male placentas produce more proinflammatory molecules than female placentas, while people carrying male fetuses produce fewer antibodies in response to infection, a study finds.

The CDC now suggests that only children who were within 3 feet, not 6 feet, of an infected student should quarantine, provided they were masked in a classroom. Does the science support this change?

Health authorities in both countries announced that people under certain age cutoffs are now ineligible for the Spikevax COVID-19 shot due to its association with heart inflammation.

Merck reports that its antiviral molnupiravir was effective against early stages of COVID-19 in high-risk patients in a Phase 3 clinical trial.

COVID-19 has killed more than 4 million people around the globe and has sickened many millions more. The neurological toll on those of us continuing to live through the pandemic may stretch years or decades into the uncertain future.

A new, more diverse group of researchers is being appointed take over the stalled investigation.

If the immune system makes mistakes—reacting late or getting the target wrong—it can amplify the damage wrought by SARS-CoV-2.

Both of the mRNA vaccines available in the US are highly effective against severe COVID-19, but recent studies suggest that Moderna’s elicits a stronger immune response and might be better at preventing breakthrough infections.  

Correcting misinformation and providing reliable data are collective responsibilities of the research community.

In his book’s Introduction, physician-scientist Paul A. Offit reviews the unusual constellation of circumstances around the development of COVID-19 vaccines.

President Biden’s planned rollout of additional COVID-19 vaccine doses is set to begin next week, but questions remain about who should get them.

The study aims to recruit 40,000 adults and children to get a better sense of the condition that can last weeks or months after infection.

Many scientists have turned to preprints to rapidly disseminate their research on COVID-19, but some disagree with this approach.