In a message dated 30/11/2009 02:15:22 GMT Standard Time,  
[log in to unmask] writes:

EFB is  caused by nonspore-forming bacteria that are transferred throughout 
the colony  via housekeeper bees as they remove dead larvae.


"The larvae that die are normally outside the infective cycle, not being in 
 a position to infect others, as their corpses are taken from the hive by 
the  nurse bees. It is the lightly infected larvae - the ones that do not die 
- that  pass on the infection."
 
Source: Hooper and Morse, The Illustrated Encyclopaedia of  Beekeeping.
 
Chris

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