Lots of these have been popping up and going away for the last twenty years or so.
It's going to continue to happen as world population and climate change increase, with humanity encroaching more into animals habitats.
Also, we are more and more reliant on farmed animals and have adopted some unhealthy farming practices to meet the demand for food. When these diseases happen, they are more easily transmittable to humans.
It's only a matter of time before one becomes serious and just because there is one in general circulation, doesn't mean there can't be more. Most however, tend to be less serious.
They are keeping it under tabs at the moment I believe.
Pandemic hunting scientists warn of a 'perfect storm' for new diseases to emerge from wildlife.
www.bbc.co.uk