Pandemic

Bird flu in cows and goats has raised alarm in the U.S. To date, four people are thought to have caught the virus from cattle, but the risk to the general public is low.

This infection, tied to an ongoing outbreak in cows, is the first in the U.S. to cause respiratory symptoms, but not the first H5N1 case in the world to do so.

About 500 more people died from drowning each year between 2020 and 2022 than did in 2019, the CDC reports.

The patient is being treated with an antiviral drug and is believed to have been in contact with dairy cows infected with H5N1 avian influenza.

The Bulletin of the Atomic Scientists cited the threat of nuclear escalation in Ukraine, climate change and disruptive technologies as reasons to keep the clock at 90 seconds to midnight.

Evidence suggests the outbreak is being caused by several known pathogens, the World Health Organization said.

Frail people and those with preexisting conditions were most likely to die from the 1918 flu — not young, healthy adults as once believed, a study of the victims' skeletons suggests.

An updated COVID-19 vaccine made by Novavax has been authorized by the FDA, joining the two vaccines already cleared for use.

Here's a look at the science behind SARS-CoV-2 variants, including the now-dominant omicron and its many defunct relatives.

Data shows that America's excess death rates have mostly returned to pre-pandemic levels, reflecting the end of the public health crisis, experts say.