Bonjour Erwan
There is a very good paper on this from Australia. A commission visited
the USA to get more information from commercial beekeepers. Look at
http://www.rirdc.gov.au/reports/HBE/03-050sum.html
There is a link to download the full report. It is one of the very best that
you can get.
regards
Dieter Schurer, Switzerland
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