H. T. Engelhardt has "listed diverging theories of tuberculosis. He had presented these as ever so many ways of practically handling this disease. They didn't contradict each other, but 'simply' had different goals. Bacteriologists, Engelhardt said, fight a bug and to them tuberculosis is characterized by the microbes causing it; internists chart and treat a problem of the lungs; and since it is the task of those who work in social medicine to take care of the health of the population, they see tuberculosis as an infectious disease"
Engelhardt's "The Concepts of Health and Disease," in Evaluation and Explanation in the Biomedical Sciences, 1975