I think factoring in the density of bee colonies is very important in understanding the variation in symptoms that people are reporting.

> control of tracheal mites depends greatly on good foraging opportunities for bee colonies and on limited competition between colonies.  bee paralysis virus is similarly associated with large densities of bee colonies. -- Bailey

Peter D:
> this is a big continent and the natural geographic barriers are a huge hurdle for these things to cross in the normal scheme of things. So that contribution probably helps a lot too.

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