H7N9 is a cruel and unforgiving disease.
In China there have already been 38 cases and ten poeple have died from their infection.
The disease first attacks with a high fever and cough.
That is followed by severe pneumonia, then septic shock, and damage to the brain.
In the final stages the kidneys and other organs begin to shut down followed by death.
The Los Angeles Times reports the victims developed acute respiratory distress syndrome. The condition is fatal in 50% of all cases despite intervention and medication.
All three of the dead in China were treated but two died within a week and the third inside two weeks.
Doctors say they have two immediate concerns.
First, it seems humans and other mammals do not have a defense for the virus.
Secondly, with the relative ease of air travel across the world researchers are worried about the disease spreading quickly.