Early Signs Point to a Harsh Flu Season in the U.S.

The virus circulating this year is more virulent and has been spreading faster and earlier than usual.

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Scientists Grow More Hopeful About Ending a Global Organ Shortage

At an international conference, researchers at the forefront of animal-human transplantation compared notes and allowed themselves the first real optimism in decades.

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Bird Flu Is Back

After a quiet summer, the virus is hitting poultry flocks hard in the run-up to the holidays — and in the midst of a federal government shutdown.

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Three Cases of Mpox Strain Tied to Severe Illness Worry Health Experts

None of the patients, all California residents, had traveled abroad, suggesting the Clade 1 virus strain was transmitted locally.

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How a Long Island Woman Was Diagnosed With Chikungunya

A Long Island woman had no idea what had hit her. Her pursuit of an answer led to a mosquito-borne disease rarely seen in the United States.

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New York Confirms State’s First Locally Acquired Case of Chikungunya

Testing proved that a Long Island woman had been exposed to the mosquito-borne virus, which is more commonly seen in the Caribbean and Central and South America.

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Mosquito-Borne Illness Rarely Seen in U.S. Is Suspected on Long Island

Chikungunya, which is endemic in parts of South America, Africa and Asia, may be the cause of a woman’s illness.

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Scientists Begin Testing Bird Flu Vaccine in Seals

If the results are promising, veterinarians hope to give the shots to wild Hawaiian monk seals, which are endangered.

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Cases of Mosquito-Borne Chikungunya Virus Are Surging Globally: What to Know

Chikungunya, which can disable victims for years, is spreading rapidly, including in China and other places that have not seen it before.

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Rabbits With Hornlike Growths Are Hopping Around Colorado. Are They OK?

The unsightly bunnies are infected with cottontail rabbit papillomavirus, which can cause growths that resemble warts or tentacles.

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