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Frontiers in veterinary science2024; 11; 1444887; doi: 10.3389/fvets.2024.1444887

Exploring Histoplasma species seroprevalence and risk factors for seropositivity in The Gambia’s working equid population: Baseline analysis of the Tackling Histoplasmosis project dataset.

Abstract: Exposure rates to species, the causative agent of equine epizootic lymphangitis (EL), are unknown amongst working equids in The Gambia. The primary aims of this study were to estimate anti- antibody seroprevalence in the equid population in rural The Gambia and to explore risk factors for seropositivity. Unassigned: A nationwide cross-sectional study was conducted (February-July 2022), representing baseline measurements of a longitudinal cohort study. Horses ( 463) and donkeys ( = 92) without EL signs were recruited in 18 study sites. Following informed owner consent, equid clinical and management data were recorded. Blood samples were collected by jugular venepuncture, and sera were subject to the IMMY Latex Agglutination test (LAT). Seropositivity risk factors were explored by multi-level, multivariable logistic regression analysis. Study site and household variance were described using a latent-variable approach. Whole blood DNA extractions were subject to nested ITS-PCR to detect var. (HCF), and agreement with LAT results was measured using Cohen's kappa statistic. Unassigned: Anti- antibody seroprevalence in horses and donkeys was 79.9% [95% confidence interval (CI) 76.0-83.5%] and 46.7% (95% CI 36.3-57.4%), respectively. In , two multivariable models explained the maximum amount of data variability. Model 1 demonstrated increased odds of seropositivity in mares [odds ratio (OR) = 2.90 95% CI 1.70-4.95,  < 0.001] and decreased odds in horses <2.5 years (OR = 0.46 95% CI 0.22-0.95,  = 0.04; reference: ≥4.5 years). Model 2 demonstrated increased odds in horses recruited during the rainy season (OR = 2.03 95% CI 1.08-3.84,  = 0.03) and those owned by farmers reporting previous EL in their equids (OR = 1.87 95% CI 1.04-3.37,  = 0.04). Decreased odds were measured in horses <2.5 years (OR = 0.37 95% CI 0.18-0.78,  = 0.01) and horses reported to transport firewood (OR = 0.45 95% CI 0.28-0.74,  = 0.001). On multivariable analysis of , decreased odds of seropositivity were demonstrated amongst donkeys owned by households which also owned horses (OR = 0.23 95% CI 0.06-0.85,  = 0.03). HCF infection prevalence in horses and donkeys was 22.0% ( = 102/463, 95% CI 18.3-26.1%) and 5.4% ( = 5/92, 95% CI 1.8-12.2%), respectively. No significant agreement was measured between LAT and nested ITS-PCR results ( < 0.00). Unassigned: High spp. exposure was demonstrated amongst equids in The Gambia. Investigation of risk factors, including equid husbandry and management strategies, as well as geoclimatic variations, is warranted. Outcomes may inform sustainable and equitable EL control strategies in The Gambia and comparable settings worldwide.
Publication Date: 2024-09-19 PubMed ID: 39364262PubMed Central: PMC11446873DOI: 10.3389/fvets.2024.1444887Google Scholar: Lookup
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  • Journal Article

Summary

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This research article examines the prevalence and risk factors of Histoplasma species exposure among working horses and donkeys in The Gambia. It found that a high percentage of these animals have been exposed to this agent of equine epizootic lymphangitis (EL), with certain risk factors playing a crucial role. Uncovering these aspects can help develop effective disease control strategies.

Study Design and Methodology

  • The research employed a nationwide cross-sectional study, conducted from February to July 2022. The data collected serves as the baseline measurements for a forthcoming longitudinal cohort study.
  • The sample size comprised 463 horses and 92 donkeys from 18 different study sites, with all animals showing no EL signs. All owners gave informed consent before the study commenced.
  • The researchers collected blood samples and recorded clinical and management data for each animal. The blood samples underwent the IMMY Latex Agglutination test for testing Histoplasma antibody presence.
  • Risk factors to seropositivity were explored using multi-level, multivariable logistic regression analysis.
  • Additionally, whole blood DNA extractions were subject to nested ITS-PCR to detect Histoplasma Capsulatum Fungus (HCF), and agreement with the Latex Agglutination test results was measured.

Results and Findings

  • The findings revealed a Histoplasma antibody seroprevalence of 79.9% in horses and 46.7% in donkeys.
  • The study identified several risk factors influencing seropositivity—age, gender, season of recruitment, owner’s history of equine lymphangitis, and the type of work these animals perform. For instance, mares, older horses, horses recruited during the rainy season, and those owned by farmers with a previous EL history in their equids were found to have higher rates of seropositivity. The transport of firewood reduced the odds of seropositivity in horses.
  • A lower seropositivity rate was observed in donkeys owned by households that also owned horses.
  • The results from the study also showed an HCF infection prevalence of 22.0% in horses and 5.4% in donkeys, with no significant agreement dialogued between the Latex Agglutination test and nested ITS-PCR results.

Implications

  • The high seroprevalence of Histoplasma species among working equids in The Gambia highlights the importance of further investigation into risk factors such as animal management strategies, and the effect of geoclimatic variations.
  • The findings of this study could help guide the development of sustainable and equitable equine lymphangitis control strategies, not only in The Gambia but also in other regions across the globe with similar situations.

Cite This Article

APA
Cornell TR, Fye BL, Nyassi E, Ceesay F, Jallow M, Langendonk RF, Wootton DG, Pinchbeck G, Scantlebury CE. (2024). Exploring Histoplasma species seroprevalence and risk factors for seropositivity in The Gambia’s working equid population: Baseline analysis of the Tackling Histoplasmosis project dataset. Front Vet Sci, 11, 1444887. https://doi.org/10.3389/fvets.2024.1444887

Publication

ISSN: 2297-1769
NlmUniqueID: 101666658
Country: Switzerland
Language: English
Volume: 11
Pages: 1444887
PII: 1444887

Researcher Affiliations

Cornell, Tessa Rose
  • Institute of Infection, Veterinary, and Ecological Sciences (IVES), University of Liverpool, Liverpool, United Kingdom.
Fye, Biram Laity
  • Institute of Infection, Veterinary, and Ecological Sciences (IVES), University of Liverpool, Liverpool, United Kingdom.
Nyassi, Edrisa
  • Institute of Infection, Veterinary, and Ecological Sciences (IVES), University of Liverpool, Liverpool, United Kingdom.
Ceesay, Fatou
  • Institute of Infection, Veterinary, and Ecological Sciences (IVES), University of Liverpool, Liverpool, United Kingdom.
Jallow, Mahmud
  • Department of Livestock Services (DLS), Ministry of Agriculture, Livestock and Food Security, Abuko, Gambia.
Langendonk, R Frèdi
  • Institute of Infection, Veterinary, and Ecological Sciences (IVES), University of Liverpool, Liverpool, United Kingdom.
Wootton, Dan G
  • Institute of Infection, Veterinary, and Ecological Sciences (IVES), University of Liverpool, Liverpool, United Kingdom.
  • NIHR Health Protection Research Unit in Emerging and Zoonotic Diseases, University of Liverpool, Liverpool, United Kingdom.
Pinchbeck, Gina
  • Institute of Infection, Veterinary, and Ecological Sciences (IVES), University of Liverpool, Liverpool, United Kingdom.
Scantlebury, Claire Elizabeth
  • Institute of Infection, Veterinary, and Ecological Sciences (IVES), University of Liverpool, Liverpool, United Kingdom.

Conflict of Interest Statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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