Deformed Wing Virus doesn't always cause the bee to have deformed wings. It could be any of the several viral diseases that bee colonies are subject to developing. It could also be caused by insufficient feeding when the bee was a larva, or both.
So, it could have been due to not enough nurse bees or is it more than likely mites? I did see queen cells in the split and decided to shake another frame and add another brood frame with bees. It's my first split so I'm hoping it works out.
I think what is meant, is that a bee larvae the has mites sucking on it while it is in development might hatch out as a runt. Mites are quite large in comparison to the bee. So If a bee has 2-3 mites sucking the life out of it ....well you get the picture.
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