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I don't know that bumblebees aren't having similar difficulties from the same bacteria.
Bumblebees and honeybees do live differently. A bee colony exists continuously, for year upon year. A bumblebee colony exists only for the summer, just like a wasp hive. The colony dies off and the queen hibernates. A new colony in a new location is built the next year.
And that most likely is the crucial difference. The bacteria seems to exist in the woodware or wax, much like AFB spores. Since bumblebees start over new in a new location each year, they aren't going to be living in a contaminated environment like honeybees do. So I would speculate that should a bumblebee colony get this bacteria, it would die off, without anyone noticing, and that would be the end of it.
The studies I've read so far have shown that new bees on old CCD destroyed hive woodware promptly get CCD. Irradiated woodware doesn't show the same CCD problems. And, waxmoths and other normal pests that come into abandoned woodware don't show up on CCD woodware, until much later than normal.