Serial passage of the parasite Crithidia bombi within a colony of its host, Bombus terrestris, reduces success in unrelated hosts.

Abstract excerpt

In the wild, Bombus spp. bees may contract infections of the trypanosome parasite Crithidia bombi from their nestmates or from others while foraging on contaminated flowers. We expected that as C. bombi is transmitted repeatedly among related workers within a colony, the parasite population would become more successful in this relatively homogeneous host population and less successful in individuals from...

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