>Ewald showed that infectious agents that used intermediate vectors for
transmission, such as malaria's mosquitoes and cholera's contaminated
water, are free to evolve towards greater destructive power.

>The theory predicts that a disease like Varroa, that spreads easily among
colonies, will evolve towards being more benign to bees, while AFB, that
can lay dormant in the environment, being vectored by next cavities, will
tend to be more virulent.

So, what does this mean for the virus diseases that are showing up in honey
bees that are believed to be vectored by varroa?

Regards,
Dick