>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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