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Arthropod vectors carry vector-borne pathogens that cause infectious disease in vertebrate hosts, and arthropod-associated microbiota, which consists of non-pathogenic microorganisms. Vector-borne pathogens and the microbiota can both influence the fitness of their arthropod vectors, and hence the epidemiology of vector-borne diseases. The bacterium  Borrelia afzelii , which causes Lyme borreliosis in Europe, is transmitted among vertebrate reservoir hosts by  Ixodes ricinus  ticks, which also harbour a diverse microbiota of non-pathogenic bacteria. The purpose of this controlled study was to test whether  B. afzelii  and the tick-associated microbiota influence the fitness of  I. ricinus . Eggs obtained from field-collected adult female ticks were surface sterilized (with bleach and ethanol), which reduced the abundance of the bacterial microbiota in the hatched  I. ricinus  larvae by 28-fold compared to larvae that hatched from control eggs washed with water. The dysbiosed and control larvae were subsequently fed on  B. afzelii -infected or uninfected control mice, and the engorged larvae were left to moult into nymphs under laboratory conditions.  I. ricinus  larvae that fed on  B. afzelii -infected mice had a significantly faster larva-to-nymph moulting time compared to larvae that fed on uninfected control mice, but the effect was small (2.4% reduction) and unlikely to be biologically significant. We found no evidence that  B. afzelii  infection or reduction of the larval microbiota influenced the four other life history traits of the immature  I. ricinus  ticks, which included engorged larval weight, unfed nymphal weight, larva-to-nymph moulting success, and immature tick survival. A retrospective power analysis found that our sampling effort had sufficient power (> 80%) to detect small effects (differences of 5% to 10%) of our treatments. Under the environmental conditions of this study, we conclude that  B. afzelii  and the egg surface microbiota had no meaningful effects on tick fitness and hence on the R 0  of Lyme borreliosis.

Infection with Borrelia afzelii and manipulation of the egg surface microbiota have no effect on the fitness of immature Ixodes ricinus ticks