"The virus was airborne and spreads among humans, leading to a large number of deaths. Well, I think the virus must have used some medium to spread, so the effect of the virus has been weakened a lot, and the death rate has reduced significantly."
"Well, the mortality rate isn't high?" Sandy flipped through the autobiography in his hands. "It says that in the end, less than one-tenth of the human population survived the plague."
"The death rate is relatively low. When our world was attacked by the zombie virus, the death rate was close to 100%."
"In addition, the humans who survived the plague also benefited from the disaster. They were infected by the virus and their physical fitness was strengthened. Their descendants also inherited this strengthening, which is why traces of the virus can be found in the ordinary people of this world."