Immunologic evaluation of 24 month course of sublingual immunotherapy.

58 patients under 12 years of age, positive to mites (Dermatophagoides pteronyssinus and D. farinae) according to prick, in vitro specific IgE and challenge tests, suffering from asthma and rhinitis, have been randomly assigned on a double blind basis to receive per os either a biologically standardized extract of mites (active therapy TA = 30 patients) or a saline buffered solution (placebo TP = 28 patients). The serologic results are interesting. The specific IgE level differences of significance are, in comparison with the placebo group. In particular, we did observe the increase of the specific IgE level in the placebo group during the autumn, whereas after 12 months and after 24 months of active treatment there was a clear (p < 0.01) decline in serum specific IgE antibody. In the active group, there was a significant increase in IgG antibodies level after 12 and 24 months and a significant increase in IgG4 level after 24 months. In the placebo group, the level of IgG antibodies was unchanged. In the actively treated patients, a significant increase of CD8+ values and a significant reduction of the ratio CD4+/CD8+ was observed.