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Ecoepidemiological determinants of Borrelia infection in sigmodontine rodents from the Delta and Parana Islands ecoregion, Argentina


Abstract

We screened lung tissue from 770 sigmodontine rodents sampled in the Delta and Paraná Islands ecoregion for Borrelia spp. and obtained sequences clustered within the Borrelia burgdorferi sensu lato (s.l.) complex. Seventeen individuals were PCR-positive (prevalence 2.2%), distributed mainly in Akodon azarae (n = 11) and across five additional species. Using GLMMs that accounted for site and trapping session, infection probability was positively associated with individual body length and with ecological proxies of prior host and vector abundance: Ak. azarae abundance two sessions earlier (lag S−2) and Ixodes loricatus nymph abundance in the previous session (lag S−1) were the strongest predictors. These results point to transmission dynamics driven by recent host and immature-tick abundance rather than by climatic descriptors. Presence of cattle was associated with lower Borrelia prevalence in grazed grids (0.5% vs. 4.8% in Ak. azarae), and a univariable model restricted to Ak. azarae detected a significant negative association with cattle; however, this effect was not statistically significant in multivariable models that included host size and lagged abundance metrics. Our findings indicate localized endemic circulation of B. burgdorferi s.l. linked to host/vector demography, and highlight the need for integrated vector and reservoir monitoring to resolve mechanistic pathways and potential implications for animal and public health.

Data availability

The sequences generated and analysed during the current study are available in the GenBank repository, accession numbers PX740065-PX740080.

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Acknowledgements

Authors would like to thank to all personnel of INTA Delta, particularly Natalia Fracassi and Gerardo Mujica for logistic support. We thank Dr. José Venzal (CENUR Litoral Norte, Universidad de la República, Salto, Uruguay) for providing the Borrelia DNA used as positive control and Dr. Ulyses F.J. Pardiñas (Centro Nacional Patagónico, Puerto Madryn, Argentina) for his collaboration in the identification of rodents by cranium morphology.

Funding

This study was supported by Agencia Nacional de Promoción Científica y Tecnológica (Grants PICT2008-00090, PICT2019-1242).

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J.B. carried out molecular analyses on the samples, analysed the data, and helped draft the manuscript; L.R.A. collected data in the field and processed samples; V.C.C. collected data in the field and processed samples; P.M.B. collected data in the field, provided financial support, analysed the data, and drafted the manuscript.; L.D.M. collected data in the field, provided financial support, analysed the data, and drafted the manuscript. All authors gave final approval for publication.

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Correspondence to
Lucas Daniel Monje.

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Barolin, J., Antoniazzi, L.R., Colombo, V.C. et al. Ecoepidemiological determinants of Borrelia infection in sigmodontine rodents from the Delta and Parana Islands ecoregion, Argentina.
Sci Rep (2026). https://doi.org/10.1038/s41598-026-45332-4

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Keywords


  • Borrelia burgdorferi sensu lato
  • Infectious diseases

  • Akodon azarae

  • Ixodes loricatus
  • South America


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