The military has been called into Wuhan as medical personnel just cannot cope with the sheer number of people who have contracted this.
Make no mistake, that 900 figure is not the truth. You can times it by ten and you may get somewhere closer to the truth. Number of deaths is also likely to be many times higher than has been reported.
We should leave the Chinese to deal with it how they see fit for themselves. However, international governments must do what's best for its people and that is to suspend all flights from China, as difficult as that is for me to think and call for. (I have family and friends in China).