The Era Has Changed

After Earthlings transmigrated to the Other World, they faced the invasion of the zombie virus and uncovered the potential in their genes. The depth and scope of their research into viruses surpassed what the virology on Earth had reached. 

There were more than one hundred virus research centers in Dragon City, and gene medicine was connected to viruses as well. 

After the zombie catastrophe sifted out the weak, the surviving humans had much stronger immune systems, and they were not afraid of most viruses. 

But to ensure that the zombie catastrophe would not happen again, when legitimate virus research centers modified brand new viruses, they had to set up defensive precautions to ensure that the viruses would not be infectious to humans.