Just to keep you posted, we have got an interesting discussion of
practical nosema diagnosis and some surprising results at:
 
http://www.internode.net/honeybee/BeeScience/Nosema.htm
 
If you have problems with this site, I apologize.  Sometimes the ISP goes
down, and ocasionally I am working on it.  So -- as always -- if you
cannot get the site to respond the first time you try, please try again a
time or two a bit later before giving up.
 
Allen