Summary — Using Serratia marcescens as an indicator bacterium and the worker brood of the honey bee, experiments have shown that Varroa jacobsoni transmits bacterial infections to a recipient bee host. Integument and haemolymph of brood artificially contaminated with S marcescens, preferably individuals with Serratia septicaemia, were the source of bacterial contamination of the mites. The infected parasites during feeding carry S marcescens to about 20% of the healthy brood.
SUMMARYProtein fractions in haemolymph of normal and Vnmoa jacobsoni parasitized drone brood were made by two acrylamide gel electrophoresis methods. Total protein content was examined following haemolymph denaturation. Basic proteins were evaluated using a discontinuous acidic buffer system.The studies reveal a reduction of the content of total proteins in haemolymph of parasitized drone brood that is related to the intensity of the invasion. The invasion alters both the clectrophoretic patterns and densities of blood proteins, especially of low molecular weight cathodal protein fractions. It is reasonable to assume from the results obtained that changes in spectra of haemolymph proteins are the result of protein depletion, but also could be connected with some biochemical changes following release of toxic substances of the mite into the body of the host.
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