Virus

The U.S. is currently experiencing very high levels of seasonal influenza across the country. Here's why.

Creutzfeldt-Jakob disease is an extremely rare and fatal brain-wasting disease that's like a human version of "mad cow."

A branch of the H5N1 bird flu family tree that hadn't previously been seen in cattle has now been detected in dairy cows.

A new virus related to the deadly Nipah and Hendra viruses has been detected in shrews in the U.S. However, scientists say there is currently "no evidence" that it has infected humans and the risk of it doing so is "likely low."

Nearly 119,000 birds have been culled at a farm in California after a bird flu called H5N9 was detected among the poultry.

Alkaptonuria is an unusual disorder caused by a defect in protein metabolism.

An ongoing tuberculosis outbreak in two Kansas counties has sickened dozens since January 2024.

Exposure to low temperatures for prolonged spells can trigger an array of different health conditions, some of which may be life-threatening.

A study suggests that catching COVID-19 significantly raises the risk of developing ME/CFS (formerly called "chronic fatigue syndrome"), a typically lifelong condition that can be debilitating.

Eight months spent following a "carnivore diet" caused a man to grow big, yellow bumps on his hands, feet and elbows.