Situ Zhi said gently, "An interesting fact is that the terrifying infectious diseases are themselves paradoxical. Transmission efficiency and the ability to cause death are difficult to reconcile. The most violent diseases can kill patients within just a few days, but this also means patients find it difficult to infect others. If a disease is to increase its transmission efficiency, it must allow patients to live longer, ideally preserving their mobility so they can travel to more crowded places. This contradiction means it's very difficult for diseases to completely, thoroughly, and comprehensively exterminate humanity. In comparison, the terror of war is even greater than that of diseases."