This is one of the most terrifying plagues, and so far, there is no effective treatment. Not only does it spread quickly, but the mortality rate is extremely high, and even the way the victims die is incredibly tragic.
Once infected with smallpox, even low-realm medical practitioners might not survive, let alone ordinary people.
If smallpox could be prevented, history would not have seen so many people die from it across various countries.
Although high-realm medical practitioners are not afraid of smallpox, they can't save too many people either.
Treating a smallpox patient can end up completely exhausting a fourth-realm medical practitioner, and it takes a long time for them to recover.
Therefore, whenever there is an outbreak of smallpox, they can only choose to treat the officials and nobles, watching helplessly as ordinary people die in large numbers.
Just being able to prevent smallpox, rather than finding a cure, would be an incredible achievement.