Chris
> The incidence of AFB is less than 2%.

I thought that it was less than 0.5% but cannot find the data.

I also seem to recall that Bailey suggested a maximum of 6 colonies per 
square mile, but I do not have the time to plough through his book to find 
it!  He did however (Honey Bee Pathology - 1981) say: 'the common wish of 
beekeepers to import bees that are alleged to be superior to their own is 
easily gratified with the aid of modern transport, but little heed has been 
paid to the dangers of introducing exotic diseases or unusual strains of 
pathogens, especially of viruses, which are not easily diagnosed'.  Wise 
words indeed.

Best wishes

Peter
52.194546N, -1.673618W 

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