The results were also published in another journal. There, they said:

the data show that bees from colonies that survived
winter in fact had significantly higher loads of N. ceranae in
November than bees from failing colonies (P  0.001), strongly
suggesting that this parasite is not responsible for colony collapse
in winter, at least in certain parts of Europe. It is conceivable that
Nosema loads were higher in surviving colonies because bees from
these colonies lived significantly longer (10 to 15% longer) and
older bees tend to accumulate more Nosema spores

Dead or Alive: Deformed Wing Virus and Varroa destructor Reduce
the Life Span of Winter Honeybees
Benjamin Dainat, Jay D. Evans, Yan Ping Chen, Laurent Gauthier, and Peter Neumann
Appl. Environ. Microbiol. 2012, 78(4):981

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