DNCB contact sensitization in leprosy: its comparison with other CMI tests

76 Lepromatous, 50 non-lepromatous cases of leprosy and 20 apparently healthy individuals were tested for Dinitrochlorobenzene contact sensitization. Only one lepromatous case and one apparently healthy individual showed negative result. E-rosette counts and leucocyte migration inhibition test were performed in 22 lepromatous, 10 non-lepromatous cases and 10 apparently healthy individuals who were all DNCB positive. Of these 2 lepromatous, 8 non-lepromatous cases and all the 10 apparently healthy individuals showed lepromin positivity. Average E-rosette counts (percentage) and mean leucocyte migratory index were significantly lower in lepromatous as compared to non-lepromatous cases.