Eighty nine cases of active pulmonary tuberculosis were classified into four stages depending on the clinical extent of disease. Leucocyte migration inhibition test (LMIT) was done using mitogen phytohaemagglutinin (PHA) and H37Ra specific antigen. Normal PHA responses were observed in all clinical stages while specific immune response in relation to inhibition of leucocyte migration decreased from stage I to stage IV. Effect of H37Ra on PHA induced release of lymphokine was studied by mixing the two and comparing the percentage migratory inhibition of the mixture with that of PHA alone. Increased or decreased values with mixture compared to those with PHA alone were regarded as enhancement or inhibitory effect respectively. Median percentage effect of H37Ra on PHA induced migratory inhibition was found to be inhibitory in first three stages and controls while enhancement effect was observed in stage IV. A total of 22 cases in all stages showed enhancement effect while 48 cases showed inhibitory effect. The possible mechanism of enhancement or inhibitory effect are discussed.
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