Of the curability of pulmonary tuberculosis there is no longer any reasonable doubt, but the prognosis will in general depend upon the promptness with which the individual case comes under observation and is subjected to treatment. Any means, therefore, that will contribute to the early diagnosis will, by so much, facilitate recovery. Often the disease will have made considerable progress before the appearance of physical signs sufficiently distinctive to explain the obscure symptoms present. The tuberculin test, although valuable, is not entirely free from risk and care must be exercised in the interpretation of its results. The utility of the serum-agglutination-test in the diagnosis of typhoid fever has suggested the application of the same expedient to other diseases, among them tuberculosis, but here there has been a wide divergence of opinion.
Observations have been recorded to the effect that the blood serum of certain animals treated with tuberculin or with
SERUM DIAGNOSIS APPLIED TO PULMONARY TUBERCULOSIS. JAMA. 1902;XXXVIII(22):1445–1446. doi:10.1001/jama.1902.02480220031008
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