In the past, every physician personally embraced the entirety of medicine as a single, unified science. It was also common for doctors to be scholars, writers, and philosophers at the same time. This remained true up until the late 19th and early 20th centuries. As medicine advanced, the sheer volume of knowledge and skills became too great for any one person to master, leading to the emergence of increasingly narrow specialties. Pediatric immunology is one such specialty, and it is still a relatively young field.

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