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Endemic caseous lymphadenitis in a wild Caprinae population.
L Varela-Castro1, J Lara-Vergara1, N Ortega2
1Servei d'Ecopatologia de Fauna Salvatge (SEFaS), Departament de Medicina i Cirurgia Animals, Universitat Autònoma de Barcelona (UAB), Bellaterra, Spain.
Caseous lymphadenitis (CLA) is endemic in Iberian ibex populations in Spain. Higher ibex population density and proximity to aggregation points increase the risk of CLA infection in wild Caprinae.
Area of Science:
- Veterinary Medicine
- Wildlife Ecology
- Epidemiology
Background:
- An outbreak of caseous lymphadenitis (CLA) affected captive Iberian ibexes (Capra pyrenaica) between 2010-2013.
- This study investigated the prevalence and risk factors of CLA in the free-ranging donor population.
Purpose of the Study:
- To assess the caseous lymphadenitis (CLA) status in free-ranging Iberian ibexes.
- To identify risk factors associated with CLA seroprevalence in this wild population.
Main Methods:
- ELISA testing for CLA antibodies in 360 hunter-harvested Iberian ibexes (2007-2013).
- Spatial analysis and regression tree models to explore CLA risk factors.
- Analysis of seroprevalence across different game management areas.
Main Results:
- Nineteen percent of Iberian ibexes tested positive for CLA antibodies.
- Seroprevalence varied significantly among game management areas.
- Higher population density and proximity to aggregation points were associated with increased CLA risk.
Conclusions:
- Caseous lymphadenitis (CLA) is endemic in the Iberian ibex population within the study area.
- Density-dependent factors influence CLA transmission in wild Caprinae.
- This is the first report of CLA maintenance in a free-ranging wild Caprinae population.
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