P12A00 and P12B00 series: "Oathbreakers"

Happy birthday to me. Happy birthday to me. I'll celebrate with a bottle of champagne. --SΣ

There are certain people involved with the medical profession who show a sort of loyalty and reverence to PRE12 "Plague Doctor". These people are informally called "Oathbreakers," in reference to the Hippocratic Oath.

Those designated with the P12A00 series are considered "lesser Oathbreakers," though they are also often called "Plague Bearers" and "Night Surgeons." They often tattoo a symbol known as the Stick and the Serpent on some part of their body, and work to ensure the spread of disease. They often work as back-alley doctors, pharmaceutical salespeople, and nurses. Aside from subtly working to infect their patients, they seem function completely normally as average members of society.

Those designated with the P12B00 series are considered "greater Oathbreakers," and are often called "Mad Doctors." They often occupy higher positions in the medical community than the P12A00 designations, being surgeons, doctors, and scientists. They are also often more specialized in their approach to causing infection than P12A00 designations are. "Greater Oathbreakers" will often experiment to find new ways of causing infection and use their patients as guinea pigs for these experiments.