I thought it was interesting that while almost 50% treated for nosema, only 21% even checked to see if they had it. 

Also:

> Based on efforts in 2007 and 2008, it was initially determined that the parasite was present in all Canadian provinces, with N. ceranae and N. apis found in approximately similar proportions. This is in sharp contrast to the U.S. where N. apis is now seldom found in samples. Changes in the distribution and prevalence of these species will continue to be monitored.

> The impact of N. ceranae on honey bees is not well understood and it is likely a factor in the survival of colonies already under multiple stresses. Currently, CAPA members employed by federal and provincial governments, as well those in Canadian universities, are undertaking research projects to better understand this parasite. Aims include determining the seasonal occurrence of N. ceranae in Canada, developing strategies for effectively managing this parasite as well as evaluating the use of novel therapeutic agents. Current indications suggest that N. ceranae is susceptible to fumagillin, the only registered therapeutic agent against N. apis.

source: CAPA Statement on Honey Bees Losses in Canada (2010)

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