It emerged recently and is carried by pigs, but can infect humans, they say.
The researchers are concerned that it could mutate further so that it can spread easily from person to person, and trigger a global outbreak.
They say it has “all the hallmarks” of being highly adapted to infect humans – and needs close monitoring.
Translated: We knew about it a while ago but now we have to say something because someone outside the circle found out. It can and has infected humans, and mutated to transmit human-to-human.
While there are no current outbreaks of the new virus, get ready.