Ebola virus was detected in samples from a child who died last week, the World Health Organization and Democratic Republic of the Congo’s Ministry of Health announce.

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

The endosymbiont Coxiella affects tick serotonin production and subsequent blood-feeding behavior, a study finds.

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.  

A high-salt diet suppressed the growth of tumors in a mouse model of melanoma, apparently because of an interplay between the gut microbiome and natural killer cells.

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 results reveal evolutionary relatives of the Cas9 enzyme now used extensively in biotechnology.

The SARS-CoV-2 variant was first detected in January, but its rising prevalence and potential resistance to vaccines has garnered it special attention from the World Health Organization.

Different variants of the virus behind the COVID-19 pandemic are swapping chunks of genetic material, but it’s not yet clear what implications that may have for public health.

So far, more than 50 people have died of a febrile illness, though the cause isn’t clear.

Dozens of researchers, including myself, worked for years to uncover that swine flu had leapt to humans from a pig in Mexico in 2009. We learned a lot about influenza evolution, pig farming, and outbreak risk along the way.

COVID-19 affects far more than just the lungs. Researchers are actively documenting the damage the disease causes to the heart, brain, liver, and much more.

Researchers’ painstaking examinations have begun to reveal how the virus wreaks havoc in multiple organs and tissues.