PPD RT23 for tuberculin surveys in India
Chadha, V.K.; Jagannatha, P.S; Vaidyanathan, P.S. and Jagota, P (2003) PPD RT23 for tuberculin surveys in India. The International Journal of Tuberculosis and Lung Disease, 7 (2). pp. 172-179.
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The differences in sensitivity of tuberculin testing using the different preparations were found to be small and statistically non-significant. Among children, a higher proportionof reaction sizes in 10-14 mm and 15+ mm categories was observed to 2TU compared to 1TU of Dilution-G. This could reflect lower specificity of 2TU in thestudy area where non-specific sensitivity is highly prevalent. Studies in India and other countries do notsuggest any loss in potency of 1TU PPD RT23 with Tween 80.
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