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>The average "VIL" is produced by a mix of very low numbers and many that we in North America would consider alarming and deadly. There is something there that requires further inquiry and analysis.
That's what made me think of the BeeWeaver study- which attributes success to viral tolerance, rather than low mite population growth and outlines the likely importance of promoting both tolerance and resistance in our breeding efforts.
'Both R and S bees showed roughly comparable levels of mite infestation, as revealed by observation of worker pupae for Varroa infestation as samples were collected for RNA extraction.’
‘The salient gene expression patterns that we observed in field and laboratory, under a variety of experimental conditions, demonstrate important differences between the two phenotypes in their response to Varroa destructor parasitism and Deformed wing virus infection. Equally important, our results allow differentiation of honey bee gene expression signals associated with viral infection in the presence and absence of mite parasites. These results have bearing on programs to understand host-parasite coevolution in a social insect and might be applied toward more sustainable strategies for reducing the impacts of parasitic mites on bees. They add support to predictions that bees surviving despite being subjected to unmanaged levels of Varroa mites do so because of their abilities to resist associated viruses.’
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