Unity can heal...
History and founding
The history of Caduceus begins at the dawn of the galactic community, or so we're told. The organization formed after several galactic powers noticed a rapid surge in pandemics stretching across their territory. These species were those with significant technological advancement. Each had ways of bypassing the vast distances of space, which only made spreading contagions easier. Civilians would expose themselves to other species without realizing the dangers of doing so, catching diseases and spreading them with disastrous results. Entire planets could die, leaving behind a lifeless world of corpses. As a response, medical communities gathered in a distant system to discuss how best to minimize the damage. This organization learned how dangerous plague ships can be, learning that most of these dead worlds began with a foreign vessel landing on the surface, despite warnings from medical professionals. As time went on, this organization would determine the first contact protocol, as well as the procedure to go through should you find yourself exposed and dying of such contagions.
The organization changed over time, altering their methods as they learned more and more about how these plagues worked. The galactic community requires each of its members to provide vessels, resources, personnel, and funding to the organization in order to ensure its growth and effectiveness, which is how humanity was able to get its foot in the door. Their fleet consists of military medical vessels, capable of fighting pirates but not able to be a million powerhouse on its own. The ships scatter about the galaxy and search for any signs of potential epidemics and Plague Ships. By maximizing distance, they can respond to any situation, but are usually on their own and without backup from others in the organization. When a situation occurs, they move in and establish a base of operations, either in orbit aboard their ships, planet side if the situation appears on a planet, or on space stations suffering from plague. They are authorized to do whatever needs to be done to contain and eliminate the problem, even if it means killing to control spread.
The organization imposes strict rules of isolation. Every member is a member for life, and will never see the surface of a planet again unless a plague is present. They do this because of the changes made to their physiology and the nature of their job. Each member has a slew of vaccines pumped into their system, and routinely take boosters to hone their immune response. Their immune system is second to none. This allows them to work together without fear, but also makes them likely carriers of the contagions they encounter. Members still wear protective equipment, but it's more than to protect themselves from new contagions they have yet to vaccinate. They wear this equipment to protect those around them from diseases they carry as well.