>>There are many possible causes for the dysentery symptoms. A very common and significant cause can be Nosema disease<<
I'm sorry but I don't agree with this - dysentery can cause Nosema but dysentery is NOT caused by Nosema - this is a very common mistake that has somehow become established in beekeeping circles.
Nosema is present in most colonies, an outbreak of dysentery can turn it into a very serious problem.
Best regards
Roger White
Superbee Cyprus.
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