EN
The aim of the study was to discover if Nosema ceranae, a new parasite of Apis mellifera, is present in Poland. The first 15 samples of bees collected after the winter from the bottom of hives sent to laboratory for analysis in 2007 were investigated. The investigation under light microscopy revealed the presence of Nosema spores in ten samples. On the basis of the spores appearance conjunctures were made that N. ceranae was present in eight samples. Samples with Nosema spores were sent to Centro Regional Apicola in Marchamalo (Guadalajara, Spain) where the team of Profesor Meana and Dr. Higes, using PCR analysis, found N. ceranae in all the samples. The studies showed that N. ceranae is present in Polish apiaries and is becoming quite a common infection, and that the appearance of spores under a light microscope can play an important role in the diagnosis of the infection.