Abstract: Zoonotic diseases have major impacts on human and animal health, as well as being ecologically significant. Lyme Borreliosis or Lyme disease, caused by infection by pathogenic members of the Borrelia genus, is among these zoonotic diseases. Serology is one of the most accessible means for indirect surveillance of pathogen presence by monitoring the presence, abundance, and type of immune response to the pathogen or pathogen-associated epitopes. Serological surveillance of wild animals is important as wild animals are the primary reservoirs of many zoonotic diseases. Similarly, serological surveillance of agricultural animals is important due to their economic importance, in addition to animal welfare concerns. However, serology in any non-model animal such as wildlife or agricultural animals is difficult because serology necessarily relies on blood samples from the animals being tested. While companion or laboratory animals are generally sufficiently accustomed to humans that blood samples can be obtained, obtaining blood samples from wild or agricultural animals is more challenging. This initial challenge is compounded by the absence of validated serological tools to evaluate antibody titres in the sera. In this chapter, we provide methods for constructing an ELISA for the detection of anti-Borrelia antibodies in non-model animals, using studies on horses and cows as a proof of principle. The methods focus on the problems specific to non-model animals including obtaining sera, options for determining positive and negative controls without the ability to perform controlled infections, and methods for test optimization and validation.
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Overview
This research focuses on developing an ELISA (enzyme-linked immunosorbent assay) to detect antibodies against Borrelia, the bacteria causing Lyme disease, in wildlife and agricultural animals.
The study addresses challenges related to serological testing in non-model animals, such as obtaining samples and validating test accuracy without controlled infection experiments.
Introduction to the Research
Zoonotic diseases, which can spread from animals to humans, significantly affect health and ecosystems.
Lyme disease, caused by Borrelia bacteria, is one such zoonotic disease with important public health implications.
Monitoring the presence of these pathogens is essential for disease surveillance and control.
Serology, the study of blood serum to detect immune responses, is a key surveillance tool because it can identify past or current infections indirectly by detecting antibodies.
Wild animals often serve as reservoirs for zoonoses, making their serological surveillance crucial.
Agricultural animals also require serological monitoring due to economic impacts and animal health concerns.
Challenges in Serological Surveillance of Non-model Animals
Unlike laboratory or companion animals, wildlife and agricultural animals are not as easily handled for blood sampling.
The physical challenge of blood collection is the first barrier for performing serology on these animals.
There is a scarcity of validated serological tests tailored to non-model animals.
Without well-established reference standards or the ability to perform controlled infections, determining accurate positive and negative controls for the test is difficult.
This lack complicates the standardization, optimization, and validation of assays such as ELISA in non-model species.
Methodological Approach of the Study
The study proposes a practical framework for constructing an ELISA to detect anti-Borrelia antibodies in non-model animals.
Horses and cows are used as example species to demonstrate applicability, reflecting both wildlife-adjacent and agricultural contexts.
Key components of the methodology include:
Careful procedures to obtain blood sera from non-model animals while minimizing animal distress and logistical difficulty.
Strategies to identify or approximate positive and negative antibody controls without performing experimental infections, such as using known naturally infected samples or closely related species’ sera.
Test optimization techniques aimed at improving ELISA sensitivity and specificity tailored to these species’ antibody profiles.
Validation approaches ensuring the ELISA results are reliable despite the lack of standard reference sera or controlled infection data.
Significance and Impact
This work contributes an important tool for expanding zoonotic disease surveillance beyond traditional model species.
Developing validated ELISAs for non-model animals facilitates monitoring Borrelia exposure in wildlife and agriculturally important animals.
Broader use of these methods can improve early detection of Lyme disease reservoirs and inform public health and veterinary interventions.
It also addresses a notable gap in zoonotic disease surveillance capabilities by adapting serological methodologies to less-studied animal populations.
Cite This Article
APA
Bland J, McGowan C, Bush E, Lloyd V.
(2024).
Constructing an ELISA for Detection of Anti-Borrelia in Wildlife and Agricultural Animals.
Methods Mol Biol, 2742, 47-67.
https://doi.org/10.1007/978-1-0716-3561-2_4
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