'The lack of doctors entering ID fellowships — and the ensuing shortage of these specialists — has been a concern for years, with experts pointing to the comparatively low earnings these physicians make as a major disincentive for doctors considering which field to enter. But this year’s numbers marked a backslide. Fully a quarter of available positions went unfilled. Among the fellowship programs, 44% didn’t fill their slots, according to data from the National Resident Matching Program.'