RT Journal Article T1 Oral fluid collection in wild boar: A field protocol A1 Relimpio, David A1 Kosowska, Aleksandra A1 Barroso Arévalo, Sandra A1 De Antonio-Gómez, Daniel A1 Gortázar, Christian A1 Barasona García-Arévalo, José Ángel AB Traditional wildlife sampling methods have limitations in providing a well-distributed, timely and accurate disease surveillance in wildlife. We developed a field protocol for collecting wild boar (Sus scrofa) oral fluid samples for non-invasive active disease surveillance using environmental ropes. We deployed ropes in field settings and tested the rope-sampled oral fluids for antibodies against Mycobacterium bovis and closely related members of the Mycobacterium tuberculosis complex (MTC). Oral fluid samples were collected from three wild boars populations in Spain with endemic tuberculosis across two seasons with contrasting natural food availability. Additionally, we studied the effect of placing the ropes close to aggregation points and of impregnating the ropes with corn powder. The results suggested that installing environmental ropes in summer, close to feeders or aggregation points, and baited with corn powder significantly increases the proportion of bitten ropes. No significant differences were observed in the effectiveness of ropes for oral fluid sampling across the three study sites. The average rate of antibody detection by ELISA was 38 % (range 34-45 %) of the bitten ropes. This method appears to be both precise and sensitive in detecting antibodies against MTC in oral fluid samples collected from environmental ropes, making it a potentially valuable tool for early detection and monitoring of MTC circulation. This noninvasive sampling method can easily be adapted for other relevant diseases of wild suids including African swine fever. Therefore, environmental ropes represent an effective, inexpensive, flexible, environmentally friendly, and noninvasive alternative for active wildlife disease surveillance. PB Elsevier SN 1090-0233 YR 2025 FD 2025 LK https://hdl.handle.net/20.500.14352/119789 UL https://hdl.handle.net/20.500.14352/119789 LA eng NO Relimpio, D., Kosowska, A., Barroso-Arévalo, S., De Antonio-Gómez, D., Gortázar, C., & Barasona, J. A. (2025). Oral fluid collection in wild boar: A field protocol. Veterinary journal (London, England : 1997), 312, 106362. Advance online publication. https://doi.org/10.1016/j.tvjl.2025.106362 NO CRediT authorship contribution statement:Gortazar ´ Christian: Writing – review & editing, Writing – original draft, Visualization, Validation, Supervision, Project administration, Investigation, Funding acquisition, Formal analysis, Conceptualization. Barasona Jose A.: Writing – review & editing, Writing – original draft, Validation, Supervision, Project administration, Methodology, Investigation, Funding acquisition, Formal analysis, Data curation, Conceptualization. Relimpio David: Writing – review & editing, Writing – original draft, Validation, Software, Investigation, Formal analysis, Data curation. Kosowska Aleksandra: Writing – review & editing, Writing – original draft, Supervision, Investigation, Conceptualization. BarrosoArevalo ´ Sandra: Writing – review & editing, Writing – original draft, Validation, Supervision, Methodology, Investigation, Conceptualization. De Antonio-Gomez ´ Daniel: Writing – review & editing, Writing – original draft, Visualization, Validation, Supervision, Investigation NO European Commission NO Ministerio de Ciencia, Innovación y Universidades (España) NO Universidad de Castilla-La Mancha DS Docta Complutense RD 21 dic 2025