Viruses

Polar bears are spending more time on land as sea ice shrinks.

Polar Bears Are Exposed to More Parasites, Viruses and Bacteria as the Arctic Heats Up

Pathogens are more common in polar bears living in the Chukchi Sea now than they were three decades ago, a new study suggests—but it's not yet clear what that means for the mammals' health

One eagle fights another for a midshipman fish in a behavior called kleptoparasitism.

'Pirate Seabirds' Could Become a Pathway for Deadly Avian Flu to Spread to Australia, Study Finds

Kleptoparasitism, in which a bird harasses another to steal its food, might introduce avian flu to the continent, currently the only one without the severe H5N1 strain

The drill site on Guliya Glacier, where researchers obtained an ice core representing 41,000 years of history.

Experts Discover 1,700 Ancient Viruses in a Tibetan Glacier

Studying how the viruses, which do not infect humans, adapted to previous major temperature shifts could hold clues to how modern viruses will react to the current climate change

Viruses known known as bacteriophages, or “bacteria eaters” in Greek, occupy the gut.

Inside the Hidden Kingdom of Viruses in Your Gut

Human innards are teeming with viruses that infect bacteria. Here's what scientists are learning about them

A colorized transmission electron micrograph of monkeypox virus particles. There have been 15,600 mpox cases and 537 deaths reported in the Democratic Republic of the Congo in 2024 so far.

WHO Declares Mpox Global Health Emergency. Here's What to Know

A new virus strain has been spreading primarily the Democratic Republic of the Congo, as well as nearby countries that had previously not reported mpox cases

A new study sheds light on the timeline of the human immune response when confronted with SARS-CoV-2 and other infectious diseases.

Why Are Some People Seemingly Immune to Covid-19? Scientists May Now Have an Answer

Researchers tracked the immune responses of 16 people intentionally exposed to SARS-CoV-2 and pinpointed a gene that seems to help resist the virus before it can take hold

Chickens on a poultry farm in Tepatitlan, Jalisco State, Mexico, on June 6, 2024. Outbreaks of H5N2 avian influenza have recently been reported in poultry in Mexico.

Man Infected With H5N2 Bird Flu in Mexico Dies. Here's the Latest on the Virus

The strain is not the same one that has infected U.S. cows and three dairy farm workers, and officials say the risk to the general public remains low

Color-enhanced transmission electron microscope images of adenovirus, which is a common cause of respiratory illnesses. Researchers identified adenovirus remnants, as well as herpesvirus and HPV, in Neanderthal remains in a new study.

50,000-Year-Old Neanderthal Bones Have Remains of Human Viruses, Scientists Find

The preliminary analysis is a first step in testing the theory that infectious diseases played a role in Neanderthals' extinction

Experts say the pasteurization process likely kills the virus, and tests are likely just detecting remnants of the dead virus.

One in Five Milk Samples Has Bird Flu Virus Fragments, Suggesting Cow Infections Are More Widespread Than Thought

The research has not yet found evidence that milk contains infectious virus, and the FDA says the commercial milk supply is safe

Bird flu was first detected in U.S. dairy cows in March. So far, infections have been detected in 33 herds across eight states.

Bird Flu Virus Detected in Pasteurized Milk, as U.S. Moves to Test More Dairy Cows

The FDA maintains that the commercial milk supply is safe, and it plans to report results of further tests in the coming days and weeks

The measles virus as seen through a transmission microscope. Rising numbers of measles cases in the U.S. threaten its eliminated status, according to a new CDC report.

U.S. Measles Cases Are Rising in 2024, CDC Warns

Health officials urge vaccination against the highly contagious virus, which has caused 121 infections in the country this year

People with long Covid sit in the audience at a U.S. Senate hearing about the condition on January 18.

Scientists Find Indicators in Blood Linked to Long Covid, Hinting at Future Treatments

One part of the immune system appeared to be overly active in long Covid patients in a small study, a finding researchers hope could help diagnose or treat the condition

Temperature varies from person to person and it differs throughout the day.

What's Really the Average Human Body Temperature?

Long thought to be 98.6 degrees Fahrenheit, the measurement is highly personal and varies depending on time of day, among other factors, new research finds

A photo from the announcemnent of this year's Nobel Prize in Physiology or Medicine. The researchers discovered a way to edit synthetic mRNA so that it could pass by cells' defense mechanisms, allowing it to be used in Covid-19 vaccines.

Nobel Prize in Medicine Honors Two Scientists Who Enabled mRNA Vaccines

Katalin Karikó and Drew Weissman discovered a way to edit mRNA so it could be used in vaccines without getting attacked and destroyed by the body

A new round of Covid-19 vaccinations was recommended by Centers for Disease Control and Prevention advisers on Tuesday.

What to Know About the New Covid-19 Vaccines, Now Recommended by CDC Advisers

Experts say the latest boosters are effective against emerging variants including EG.5.1 and BA.2.86

Covid-19 cases are on the rise in the U.S., but experts say it is not unexpected.

Covid-19 Hospitalizations Show an Uptick in the U.S. but Remain Low

Since the end of the nation's public health emergency for the virus, hospitalizations are one of the best available indicators of trends in case totals

The research team stands alongside the SARS-CoV-2 wet cyclone aerosol sampler they developed.

New Device Can Detect Covid in the Air Within Five Minutes

Researchers report the technology is 77 to 83 percent accurate in finding any of the coronavirus variants in a room

Craig's closet was unveiled at St. Vincent's Triangle earlier this month.

New Sculpture Comes to New York City's AIDS Memorial Park

"Craig's closet" stands near the former site of St. Vincent's, a hospital at the center of the city's AIDS epidemic

A medical professional prepares a Covid-19 booster shot in Freeport, New York, on November 30, 2021.

Fall Covid-19 Boosters Should Target New Variants, FDA Advisers Say

The shots would no longer take aim at the virus's original strain, which experts say is not likely to return

Because moose are largely solitary, it's unlikely a rabies outbreak will occur in Alaska's population, according to officials.

First Rabid Moose Recorded in Alaska Was Stumbling Through a Town

The large mammal likely contracted the virus from a fox, say wildlife officials

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