Re: I beg to differ - there are dozens of peer reviewed studies
My recollection of the Pettis study is that several bees died in the cage from the control group. These dead bees were discarded from the study, and it was never investigated if these bees had nosema or if nosema contributed to their deaths. Given that these bees were intentionally inoculated with nosema, and susceptibility to nosema was what was being investigated.
The perils of benefactors; The blessings of parasites; Blindness blindness and sight -Joni Mitchell 'Shadows and Light'