Ok, my overwintered hive is just about dead (3 frames of bees left - was booming just a month and a half ago).
I believe, from today's inspection, that I have EFB, but the books I've read say EFB is not common.
Symptoms - no foul smell, no real smell of any kind, not even the normal "good" smell. Dead larvae, all at the last stages. The larvae are laying longways in the cell, sort of twisted. Some are yellowish, then brown, then black. No pupal tongue sticking out, does not rope when poked. Some of the larvae look almost like chalkbrood.
Many larvae cells look like they had the cappings partially chewed off. Larva inside are dead.
Queen was superceeded, new one failed to do well, and I suspect they killed the bought queen I added, as I have eggs (singles) in pollen, really spotty pattern. Several brood in all stages (including some more that have died longways in the cell, slightly twisted) Still some worker brood but mostly drones.
I'd like to take a picture, but I can't get a good one of the brood.