Krishnaswami, K.V.; Abdul Rahim, M. and Parthasarathy, R. (1981) BCG test. Indian Journal of Tuberculosis, 28 (3). pp. 136-139.
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In our previous study, the value of B.C.G. as a diagnostic test vis-a-vis P.P.D. 1TU and 5 TU was studied and the former was found to be no superior. In (he present study, a higher strength of 10 TU PPD RT 23 with Tween 80 has been compared with BCG. The proportion of BCG Positives on the 5th day was found to be comparable to Tuberculin Positives on the 3rd day, the optimum level of induration size as an index of infection being 10 mm or more for both BCG and Tuberculin tests. The highest values of both Relative Sensitivity and Relative Specificity are 78.4 % and 73. %. Of the cases detected radiologically among the less than 20 year old subjects of the study, 25.71 % were non reactive to B.C.G. against only 8.5% being non reactive to 10 TU. the difference being statistically significant, four cases were bacillary and they were reactive to both BCG and PPD. It is confirmed that the reaction to BCG approximates closely to that obtained with 5 and 10 TU of PPD RT 23 with Tween 30 and that BCG test is of no superior value.
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