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Histometric and morphological damage caused by Serratia marcescens to the tick Rhipicephalus microplus (Acari: Ixodidae)

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Abstract

Rhipicephalus microplus tick is the ectoparasite causing the greatest economic losses in the livestock industry. Multi-resistance in ticks is increasing, generating the inefficiency of traditional ixodicides, for which biological control has been proposed as an alternative. In this work, we analyze the histomorphological damage caused by the bacterial strain EC-35 on Rhipicephalus microplus. The ixodicidal effect of EC-35 total protein was evaluated on larval or adult ticks comparing with the commercial ixodicide coumaphos 0.02% as a control. Female ticks were processed using the paraffin-embedding technique and stained with hematoxylin–eosin. Also, the pathogenicity of EC-35 was evaluated by capillary feeding and coelom inoculation tests. The identification of the bacterium was performed using the molecular markers 16S RNA and rpoB, by PCR and sequencing technique, and the evolutionary distance was analyzed by Bayesian phylogenetic inference. No differences were observed in the perimeter and area of larvae treated with EC-35 or Coumaphos. The thickness of the integument decreased a 65% with the EC-35 treatment (6.01 ± 0.6 µm) and of 30% in coumaphos (12.04 ± 1.2 µm) in larvae compared with the control group (18.41 ± 2 µm), while no difference was found in adult ticks. The capillary feeding test and coelom inoculation with EC-35 showed an inhibition of reproductive potential of 99.8 ± 7 and an oviposition Inhibition 97 ± 3.02%. The EC-35 strain was genetically related to Serratia marcescens, concluding that these bacteria caused high mortality, oviposition Inhibition, and integument thinning and drastic loss of histoarchitecture in R. microplus tick larvae.

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Acknowledgements

ECS acknowledges the PhD fellowship awarded by the National Council for Science and Technology (CONACyT 811487). Authors acknowledge the technical support from M.C. Erika Segura Salinas.

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The authors did not receive support from any organization for the submitted work.

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Conceptualization: GPC, IFP; Methodology: ECS; Formal analysis and investigation: ECS, GPC, RHO, RLQ, IFP; Writing—original draft preparation: ECS, CHC; Writing—review and editing: ECS, CHC; Resources: All authors; Supervision: GPC, IFP, RHO. All authors read and approved the final manuscript.

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Correspondence to Ivan Flores-Perez or Ruben Hernandez-Ortiz.

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The authors declare no competing interests.

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The authors have no relevant financial or non-financial interests to disclose.

Ethical approval

No approval of research ethics committees was required to accomplish the goals of this study because experimental work was conducted with an unregulated invertebrate species (ticks). Regarding the production of ticks on cattle, it was approved by the Animal Experimentation and Ethics Committee of the Nacional Center of Disciplinary Research in Animal Health and Safety of the National Institute for Forestry, Agricultural and Livestock Research (Castro-Saines et al 2021).

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Communicated by Yusuf Akhter.

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Castro-Saines, E., Peña-Chora, G., Hallal-Calleros, C. et al. Histometric and morphological damage caused by Serratia marcescens to the tick Rhipicephalus microplus (Acari: Ixodidae). Arch Microbiol 204, 677 (2022). https://doi.org/10.1007/s00203-022-03275-0

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  • DOI: https://doi.org/10.1007/s00203-022-03275-0

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