CCD, as defined by the symptoms, 'disappears' in the summer.  It has  tended 
to re-merge each fall, starting as early as August in some cases, but  
becoming more evident by October/November.
 
We are beginning to get an escalating number of calls from beekeepers with  
colony loss problems.  Now that we can better see what these bees do and do  
not have in terms of pathogens, we hope to be able to get a better fix on things 
 - not just assign them to CCD because they fit the CCD symptoms.
 
Finally, I've stated many times that we at UM believe that CCD symptoms  
change with the seasons.  In mid-summer, the main symptom is that the  colonies 
are unusually slow to grow, may be poor at storing honey, may even go  off feed 
(which in some cases may be due to Nosema ceranae).
 
These colonies need to be monitored - they're much more likely to express  
CCD in the fall or winter.
 
Jerry



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