Viruses

The H5N1 avian flu is circulating in cows and other mammals. Whether it will make a permanent leap to humans is another question

Influenza viruses like bird flu can mix and match their genomes, and this has played a role in at least three of the last four flu pandemics

As the measles outbreak in the U.S. gets bigger, HHS’s secretary Robert F. Kennedy, Jr., touts nonvaccine treatments. But they generally don’t help and can carry dangers

A shameful mass propaganda campaign is unfolding in the U.S., one that will make millions of kids needlessly sick with measles

A team of researchers traced the wild animal source of the mpox virus to the fire-footed rope squirrel

The detection of bird flu in a sheep is another sign that the H5N1 virus is adapting to hop to new hosts

After 150,000 articles and 17 million genome sequences, what science has taught us about SARS-CoV-2

Low vaccination rates and undetected infections are driving the measles outbreak in West Texas

With hospitalizations and at least nine confirmed cases, health officials race to contain a growing outbreak in a community with low vaccination

Bird flu is infecting more people than we think. We need to stop it now before a new pandemic begins

COVID levels may have peaked but flu is still high; RSV is on the way out

A common respiratory virus called human metapneumovirus, or HMPV, has been spreading in some countries in Asia, including China, India, Malaysia and Kazakhstan. Here’s what we know