Abstract
Introduction
Leptospirosis, caused by Leptospira spp., is a zoonosis with multiple hosts and reservoirs. Thus, the “One Health” approach must be addressed in order to guide prevention and control measures regarding this microorganism. There are few studies involving all stages of the pig production cycle and potential sources of infection such as water sources, which could represent a risk for local rural communities.
Objective
To identify Leptospira spp. in the animal-environment interface (swine-water) in the pig production cycle.
Materials and methods
The study was conducted in a swine farm in Puerto López in the department of Meta, Colombia. Swine blood samples (n = 65) were collected for microscopic agglutination test (MAT), while urine and water samples (n = 80) were tested for Leptospira using bacterial isolation, serotyping of the isolates, and polymerase chain reaction (PCR).
Results
A total of 58 (89.2%) porcine sera were positive for at least one Leptospira serogroup, with Grippotyphosa as the most frequent serogroup. Leptospira spp. were isolated in 25% (20/80) of the urine and water samples. Leptospira-positive cultures were 100% (20/20) identified within the genus Leptospira (rrl gene) and 50% (10/20) corresponded to pathogenic species (lipL32 gene) by PCR, and 45% (9/20) were positive to at least one antiserum. None of the direct urine and water samples was positive by PCR.
Conclusion
It is suggested that the bacteria might be transmitted in the animal-environment interface in the pig production cycle.

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Data availability
Not applicable.
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Acknowledgments
The authors are grateful to the Universidad de La Salle, to the research group Molecular Biology and Immunogenetics (BIOMIGEN), to the owner of the pig farm and to the researchers and students who collaborated in the field and laboratory activities of the study.
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The research group Molecular Biology and Immunogenetics (BIOMIGEN) of the Universidad de La Salle supported this study, as well as researchers’ own resources.
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Maria Catalina Ospina-Pinto did the sample collection. Patricia Hernández-Rodríguez and Maria Catalina Ospina-Pinto designed the experiments, performed the microscopic agglutination test (MAT), the Leptospira spp. isolations, the serological classification of the isolates, and the polymerase chain reaction (PCR). All authors analyzed the data and contributed to the manuscript writing, reviewed and approval.
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This study was approved and performed under the guidelines of the Ethics Committee of the Faculty of Agricultural Sciences from the Universidad de La Salle under the code 76141209. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. The manuscript does not contain any research involving human participants.
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Ospina-Pinto, M.C., Hernández-Rodríguez, P. Identification of Leptospira spp. in the animal-environment interface (swine-water) in pig production cycle. Trop Anim Health Prod 53, 155 (2021). https://doi.org/10.1007/s11250-021-02567-9
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DOI: https://doi.org/10.1007/s11250-021-02567-9


