Problems in defining a case of pulmonary tuberculosis in prevalence surveys

Narain, Raj; Nair, S.S.; Naganna, K.; Chandrasekhar, P.; Rao, G.Ramantha and Lal, Pyare (1968) Problems in defining a case of pulmonary tuberculosis in prevalence surveys. Indian Journal of Tuberculosis. pp. 701-728.

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An analysis of data from two successive tuberculosis prevalence surveys (conducted at an interval of 18 months) in a random sample of villages in Bangalore District, South India, has shown that the term " a case of pulmonary tuberculosis "does not represent a single uniform entity, but rather embraces cases of several types, differing considerably in their mortality experience, tuberculin sensitivity, results of X-ray and sputum examinations, and in the reliability of their diagnosis. The status at the first survey of the cases found at the resurvey and that at resurvey of those found at the initial survey give an indication of changes with time. Such changes show considerable differences for the various types of cases and provide another dimension to study the differences among them. The authors consider that, in spite of the great need and importance of a single straightforward definition of a case, no such definition is suitable for all situations; there is no other option but to continue to use more than one definition. Although, theoretically, finding a single bacillus in the sputum should be adequate proof of pulmonary tuberculosis, it is shown that finding, of a few bacilli, 3 or less, is probably far too, often due to artefacts and should not be the basis for a diagnosis.The findings also well bear out the notion that positive radiological findings, in the absence of bacteriological confirmation, indicate not pulmonary tuberculosis, but only a high risk of the disease. Direct microscopy appears to be a consistent index of disease but, in community surveys, has the, limitations of missing a substantial proportion of cases and of adding some false cases. The extent of these limitations, so far as symptomatic patients in a community tuberculosis control programme are concerned, remains to be investigated.

EPrint Type:Article
Additional Information:From the National Tuberculosis Institute, Bangalore-3, India. This paper is also being published in the Indian Journal of Tuberculosis.
Uncontrolled Keywords:Pulmonary tuberculosis, India, Survey, Sputum
Subjects:Fluids and Secretions > Bodily Secretions > Sputum
-Institutional Repositories > National Tuberculosis Institute
Geographic Locations > Asia > Asia, Western > India
Investigative Techniques > Epidemiologic Methods > Data Collection > Vital Statistics > Morbidity > Incidence
Investigative Techniques > Epidemiologic Methods > Data Collection > Vital Statistics > Morbidity > Prevalence
Respiratory Tract Diseases > Lung Diseases > Tuberculosis, Pulmonary
ID Code:396
Deposited By:Librarian Sudha S Murthy
Deposited On:28 July 2005

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