This story is part of a larger series on viroids and virusoids, small infectious RNAs. It is also the fifth installment in a series on hepatitis D virus, a virusoid-like pathogen that causes serious ...

These changes in its genome favor the virus's ability to spread and adapt to mammals, such as cows. In March 2024, an outbreak of avian flu was first detected in dairy cows, specifically on farms in ...

Huge die-offs of elephant seals occurred after the virus gained nearly 20 troublesome new mutations, scientists found. By Apoorva Mandavilli Elephant seals in South America died in massive numbers ...

Johnson & Johnson said on Thursday its experimental coronavirus vaccine prevented hamsters from getting severely ill, as the drugmaker seeks to begin large, late-stage studies in humans later this ...