Scientists say they have discovered a new coronavirus which originated in dogs and has infected a handful of people - the majority of them children.
If correct it would be the eighth such virus known to jump from animals to humans - and the first to come from a dog. But it is not thought to be a pandemic risk at the moment, and all those who tested positive had recovered.
The study in Clinical Infectious Diseases could help prevent future outbreaks, experts say. Coronaviruses are expected to become more frequent as humans will have more contact with wildlife due to habitat destruction and climate change.
Co author Dr Anastasia Vlasova, of The Ohio State University, said: "At this point, we don't see any reasons to expect another pandemic