There are around 20 described viruses that can affect bees. The problematic viruses for bees are associated with the varroa mite, including, in particular, the deformed-wing virus.
Bienenviren - ein wenig bekanntes Gebiet (German (PDF, 131 kB, 27.01.2017), French (PDF, 129 kB, 27.01.2017) and Italian (PDF, 133 kB, 27.01.2017)) Bee viruses - a little known topic
H. Berthoud, A. Imdorf, J.D. Charrière, M. Haueter, P. Fluri (2005)
