<Which Nosema? What I have heard is they do not share the  same characteristics as far as winter survival, for example. NC survives  cold.>

The viability of N. ceranae spores is significantly reduced following
one week in a deep freezer, which is not the case for N. apis
(Fries and Forsgren, 2009). This difference in temperature sensitivity
between parasite species probably has epidemiological
implications and may decrease transmission opportunities for N.
ceranae, at least on wax exposed to freezing temperatures during
storage.

Nosema ceranae in European honey bees (Apis mellifera)
Ingemar Fries  / Journal of Invertebrate Pathology 103 (2010) S73–S79

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