That's probably the best reason to have a PMH (Permanent Medical Hologram) aboard all ships now (past the Voyager era). One doctor programed with the experience of thousands of Federation doctors required to deal with hundreds of species, the Federation would soon require something like that on every ship capable of running those holographic programs, or even just a 2D doc on the screen to direct the efforts of a smaller, less capable staff and smaller, less equipped ships.Star Trek has never really addressed the difficulty of doctors learning how to treat every single different species they might come across. It's hard enough to master one species. In a realistic multi-racial starship they'd probably need a dedicated specialist for every species and teach doctors they need to constantly learn the bare basics of every species they are responsible for.
Unless the educational system of the future has found a way to accelerate learning and memory retention, I'm not sure how else it could reasonably be done and still expect a multi-species starship to cope with most medical emergencies and routine medical problems.
And with growing and greater computer power and holographic emitters, more doctors and nursing staff beyond one would likely be the norm, too. But you'll still need RL docs and nurses in case those systems fail - more as back up, at some future point, than chiefs of medicine. Sure, I could foresee when the medical holograms are more reliable and available than regular doctors, so naturally they would be in charge of medicine aboard every top rated starship.
But before that time, you take what you can get from the people who are willing to go and live in those dangerous conditions. If you get one guy like Phlox, consider yourself lucky.
Doctor Phlox.
https://www.trekbbs.com/threads/phototrek.288654/page-2#post-12083790
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