Bailey wrote:

In August, the disease cleared up spontaneously, and could not be induced, even with inocula of bacterial suspensions from E.F.B. larvae. Other observations in Denmark showed that the disease became most severe soon after inoculated colonies had been moved a short distance and thus lost their foraging bees. This effect may resemble those following a sudden change in the number of unsealed larvae in infected colonies (Bailey, 1960). 

The conditions known to affect E.F.B. may be related to unknown factors that can enable severe disease to become established (as it is in west and north- west Jutland and southern England), or can prevent its development (as in areas free from E.F.B.). For example, 11 severely diseased colonies in Denmark, moved by one of us (N.L.) from endemically infected areas to E.F.B.-free areas, recovered spontaneously and became apparently entirely healthy by the second year.

PLB

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