Leprosy was born from mycobacterium leprae. It was a chronic infection that had long since been extinguished on Earth.
But when Earthlings transmigrated to the Other World, a lot of the viruses on Earth were stimulated by the environment of the Other World and mutated into dozens or even hundreds of subtypes, as if they went through the Big Bang.
Many of Earth's viruses also fused bizarrely with the viruses of the Other World and gave birth to the zombie virus that was known as the king of all viruses.
There were more than one hundred subtypes of zombie virus, but not all of them were fatal.
However, most of them would eat the human body and leave them disfigured and deformed. They were even more terrifying than the lepers from ancient times.
Some zombie virus subtypes would even activate the gene fragments that had been lying dormant for millions of years in the depths of human cells and humans would show all sorts of atavism symptoms.
