Samples of dead bees collected in June from 2 apiaries in Warsaw were investigated for viruses and Nosema apis. Seven viruses were identified. The prevalence of filamentous virus (FV), black queen cell virus (BQCV) and bee virus Y (BYV) were associated with a high level of Nosema apis invasion. The prevalence of deformed wing virus (DWV) was preceded by a heavy invasion of Varroa ja- cobsoni during the previous beekeeping season. Single cases of acute paralysis virus (APV), chronic paralysis virus (CPV) and sacbrood virus (Samples of dead bees collected in June from 2 apiaries in Warsaw were investigated for viruses and Nosema apis. Seven viruses were identified. The prevalence of filamentous virus (FV), black queen cell virus (BQCV) and bee virus Y (BYV) were associated with a high level of Nosema apis invasion. The prevalence of deformed wing virus (DWV) was preceded by a heavy invasion of Varroa ja- cobsoni during the previous beekeeping season. Single cases of acute paralysis virus (APV), chronic paralysis virus (CPV) and sacbrood virus (SBV) were noted. Apart from SBV all the viruses were discovered for the first time in bees from Poland. No cloudy wing virus (CWV), bee virus X (BVX) or Kashmir bee virus (KBV) were detected.SBV) were noted. Apart from SBV all the viruses were discovered for the first time in bees from Poland. No cloudy wing virus (CWV), bee virus X (BVX) or Kashmir bee virus (KBV) were detected.
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