Dairy cattle in Nevada have been infected with a new type of bird flu that's different from the version that has spread in herds since last year.

Scientists searching for the origins of COVID-19 have zeroed in on a short list of animals that possibly helped spread it to people.

Did the coronavirus originate in animals or leak from a Chinese lab.

Nearly two years into the COVID-19 pandemic, the origin of the virus tormenting the world remains shrouded in mystery.