Key points from article :
H7N9 is an avian flu that was discovered in China in 2013. Since its discovery, there have been multiple waves of infections in humans and in 2016 the infection rate started to increase much more than before. Of the infected, 40% has died.
Researchers from The University of Tokyo found that the virus is spreading not only from poultry to humans but also human to humans, albeit at a slow pace.
This allows influenza to develop more mutations and it could be the key to becoming pandemic.