Do not have the paper, just read the abstract.

The results of these trials indicated that both *N. ceranae* and *N.
apis* could
be present in these beehives without causing disease symptom and that there
is no evidence for the replacement of *N. apis* by *N. ceranae*, supporting
the hypothesis that nosemosis is not the main reason of the collapse and
death of beehives.

http://www.sciencedirect.com/science/article/pii/S0022201112001693
Abstract

Nosemosis is caused by intracellular parasites (*Nosema apis* and *Nosema
ceranae*) that infect the midgut epithelial cells in adult honey bees.
Recent studies relate *N. ceranae* to Colony Collapse Disorder and there is
some suggestion that *Nosema* spp., especially *N. ceranae*, induces high
mortality in honey bees, a fact that is considered as a serious threat for
colony survival.

604 samples of adult honey bees for *Nosema* spp. analysis were collected
from beekeeping colonies across Spain and were analysed using PCR with
capillary electrophoresis. We also monitored 77 Andalusian apiaries for
2 years; the sampled hives were standard healthy colonies, without any
special disease symptoms.

We found 100% presence of *Nosema* spp. in some locations, indicating that
this parasite was widespread throughout the country. The two year
monitoring indicated that 87% of the hives with *Nosema* spp. remained
viable, with normal honey production and biological development during this
period of time. The results of these trials indicated that both *N. ceranae*
 and *N. apis* could be present in these beehives without causing disease
symptom and that there is no evidence for the replacement of *N. apis* by *N.
ceranae*, supporting the hypothesis that nosemosis is not the main reason
of the collapse and death of beehives.

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