Measurements of blood flow and histometry of the cellular infiltrate in tuberculin skin test responses of the typical Koch type and the non-turgid variant form (Listeria-type) in pulmonary tuberculosis patients and apparently healthy controls.

The typical turgid Koch type and the non-turgid variant form (Listeria-type) of the tuberculin skin test responses were studied in 76 newly diagnosed pulmonary tuberculosis patients and 29 apparently healthy factory worker controls from Surabaya in Indonesia; in general, the patients had more intense responses than the controls. The blood flow velocity (RBCflux) at the centre of the reaction was similar in all groups, but central relative slowing (a presumed forme fruste of severe ischaemia) was much more common in the Koch-type reactions in tuberculosis patients. In both groups of subjects, the overall density of cellular infiltrate (and the major populations of inflammatory cells) was greater in the typical Koch-type reactions than in the non-turgid variant reactions. Thus the Koch-type reactions were indubitably more intense in inflammatory terms than the non-turgid variant form, but the results of this study do not exclude the possibility that there were underlying qualitative differences in pathogenesis between reactions of the two types as well as the obvious difference in severity.