>The data from the statutory inspections of colonies in England and Wales show
>that in 1952-54 the incidence of AFB in England and Wales was 1.5% of the
>colonies inspected. The corresponding figure for 2004 was 0.3%.
>
>What is the definition of "high"?
In the US, I think beekeepers would consider 5% or more to be high.
here are some figures
Table One
NY Apiary Statistics (AFB) 2002
Apiary Size Apiaries Colonies Rate
1-10 405 1565 89 5.67%
11-20 90 1361 44 3.23%
21-30 73 2018 86 4.26%
31-40 68 2766 34 1.23
41-50 8 379 0 -
50+ 41 3593 06 0.17%
Statewide
Apiary Disease Rate 14.75%
Colony Disease Rate 4.50%
* * *
Table 2. Comparison of American foulbrood disease and Varroa mite
infestation in Iowa apiaries in 1992. *percent of E.R. tests pos.
Number of: Examined AFB Varroa
__________________________________________________________
Colonies 9,742 305 (3.1%) --- (13%)*
Apiaries 1045 78 (7.5%) 136 (13%)
Beekeepers 354 48 (14%) 63 (18%)
Counties 95 38 38
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