New article in Naturwissenschaften states:

We clearly demonstrate an increase in pathogen growth within
individual bees reared in colonies exposed to one of the most
widely used pesticides worldwide, imidacloprid, at below
levels considered harmful to bees. The finding that individual
bees with undetectable levels of the target pesticide, after
being reared in a sub-lethal pesticide environment within the
colony, had higher Nosema is significant. Interactions between
pesticides and pathogens could be a major contributor
to increased mortality of honey bee colonies, including colony
collapse disorder, and other pollinator declines worldwide.

Pesticide exposure in honey bees results in increased
levels of the gut pathogen Nosema
Jeffery S. Pettis & Dennis vanEngelsdorp &
Josephine Johnson & Galen Dively
2012

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