"My opinion is you missed the fact you had nosema in the fall."
 
That is also my opinion.  It is also of concern that early testing didn't show a problem with nosema at all.
 
"I would treat the dead out comb with acetic acid before reinstalling bees.
 
I have also heard you could heat treat the old combs at 120F for 3-4 hours and kill off 90-98% of the spores, how does this compare with acetic acid?  Thanks.
 
Jim   
 
http://www.northernqueens.com/
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Back to work after baby–how do you know when you’re ready?
http://lifestyle.msn.com/familyandparenting/articleNW.aspx?cp-documentid=5797498&ocid=T067MSN40A0701A
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