Abstract
Social immunity is vital for protecting honey bee colonies from pathogens and parasites. Among these threats, the parasitic mite Varroa destructor is particularly devastating, both by weakening parasitized bees and by transmitting several potentially lethal viruses, most notably Deformed Wing Virus (DWV). To counteract varroa and the damage caused by viral epidemics, honey bees exhibit complex, socially organized hygienic behaviours, including Varroa Sensitive Hygiene (VSH), in which workers detect and remove varroa infested brood. A related behaviour, known as recapping, involves workers opening, inspecting, and re-sealing brood cells. While the triggers for VSH are increasingly understood, the factors driving recapping remain largely unexplored, especially the potential role of brood viral infections. This study investigates the relationship between brood viral infections and recapping, and whether this relationship differs between naturally varroa-resistant and non-resistant colonies. Building on earlier work linking varroa-parasitized brood to recapping, our results provide evidence that viruses may also play a role in this behaviour. These findings suggest that worker bees may be able to detect changes induced by different virus infections and modulate recapping accordingly, highlighting a nuanced interplay between pathogen pressure and social immunity.
Data availability
The datasets generated during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
Many thanks to Michelle Flenniken and Katie Daughenbaugh of Montana State University, USA, for help with the LSV primer sequences.
Funding
Open access funding provided by Swedish University of Agricultural Sciences. This research was funded by the European Research Council (ERC Starting Grant No. 949223 awarded to BL) and the Swedish Research Council FORMAS (nr: 2021–005599 awarded to BL). Research colonies and infrastructure is maintained through support from the Swedish Board of Agriculture. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Research Council Executive Agency. Neither the European Union nor the granting authority can be held responsible for them.
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Conceptualisation: BL; Methodology: BL, CB; Investigations: CB, NK; Validation: AN, JdM; Formal analysis and data curation: AN; Visualization: AN; Resources: BL, SK; supervision: BL, SK, NK; Project administration and funding acquisition: BL; Writing original draft: AN, CB; all authors contributed to reviewing and editing the final manuscript.
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Noël, A., Boer, C.G.A., Kotrschal, S.D. et al. Evidence for virus-associated recapping behaviour in honey bees (Apis mellifera) with differential detection sensitivity between varroa-resistant and non-resistant colonies.
Sci Rep (2026). https://doi.org/10.1038/s41598-026-44836-3
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DOI: https://doi.org/10.1038/s41598-026-44836-3
Keywords
- Deformed Wing Virus
- Sacbrood Virus
- Varroa-Sensitive Hygiene
- hygienic behaviour
- parasite-host interaction
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