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It is a fact to which no exception can be taken that many of those afflicted with lung tuberculosis eventually entirely recover from the disease. The chain of evidence is complete: the sufferers have presented its symptoms and physical signs, tubercle bacilli have been demonstrated in the sputa, there has been a gradual return to health, they have died long years afterward of some totally foreign affection, and postmortem examination has shown the remains of their once active disease in the form of fibroid encapsulating processes and evidences of calcareous degeneration. Every pathologist knows that many cases dying from other causes show at the autopsy healed tubercular lesions, particularly at the apices of the lungs. A most careful review of the lives of many of these people would fail to reveal a history of any illness of such a character as to point to the lungs as the offending organ.
IMMUNITY IN TUBERCULOSIS.. JAMA. 1899;XXXII(20):1120-1121. doi:10.1001/jama.1899.02450470042012