Occupationally, doctors are exposed to infectious diseases. Unaware at the time of the need to wash their hands, doctors inadvertently served as the spreaders of disease. They even knew about bacteria back then. They just refused to believe that such small things could harm a big human being. It took decades, and the self-sacrificial determination of people like Ignaz Philipp Simelweis, Oliver Wendell Holmes, and Louis Pasteur, to sway medicine from its dirty course.
Cultural patterns die hard.
The moral of this story is that medicine is also a product of the culture, equally bound as any other profession or occupation to the same set of cultural assumptions and practices that bind, and blind, all people. This means that medical doctors and researchers are like the blind leading the blind when it comes to identifying culture-caused, or culturogenic, disease. If any one of these behaviors causes disease, they will suffer from it like everyone else. And since cultural patterns are taken for granted and are rarely questioned, they will be ignorant of the cause of the disease like everyone else. This means that you cannot turn to medicine for answers to the cultural causes of disease, since medicine is also a product of the culture.