Fig. 3. : levels of IgG1, IgG2, IgG3 and IgG4 against NDO-HSA, LID-1 and NDO-LID in paucibacillary (PB) and multibacillary (MB) leprosy patients and their household contacts of PB (HHC-PB) and MB (HHC-MB). Each point represents the result obtained from an individual serum sample, with the bars representing the median. EI = Elisa index.