Scientists have found a "blueprint" for a universal flu vaccine, according to the leader of a research project into influenza, said Professor Lalvan:
Our findings suggest that by making the body produce more of this specific type of CD8 T cell, you can protect people against symptomatic illness. This provides the blueprint for developing a universal flu vaccine.
We already know how to stimulate the immune system to make CD8 T cells by vaccination.
Now that we know these T cells may protect, we can design a vaccine to prevent people getting symptoms and transmitting infection to others.
This could curb seasonal flu annually and protect people against future pandemics.
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Mr Kim has made two recent visits to China.
The study looked at the development of 422 children over the course of eight years.
The president said they will come into force if China refuses to change its practices.