Honey bee venom specific immunoglobulin G4 in honey bee sting allergic patients and bee keepers.

Honey bee venom (HBV) IgG4 antibody was studied in bee keepers and honey bee sting allergic patients on immunotherapy using mouse monoclonal anti-human IgG4 antibody in a modified microtiter solid phase radioimmunoassay (MSPIRA). The mean HBV IgG4 in bee keepers was 31 units/ml. In patients the mean HBV IgG4 pre- and post-immunotherapy were 2.9 and 11.6 units/ml, respectively, representing a mean rise of 7.3-fold as compared to a rise of 1.6-fold for total HBV IgG. The mean HBV IgG level in bee keepers was 14 micrograms/ml which was not significantly different from the mean level of 17 micrograms/ml in allergic patients at diagnosis. The percentage interference of HBV IgE detection in vitro correlated with HBV IgG but not with HBV IgG4. On the other hand, there was an inverse relationship between serum HBV IgE and HBV IgG4 levels while none was found for HBV IgE and IgG.