2026-06-28T20:04:55Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/1348072026-04-15T23:54:16Zcom_20.500.14352_14col_20.500.14352_15
A dual-gene-deleted ASFV Lv17/WB/Rie1-ΔCD candidate administered orally to wild boar confers DIVA-compatible protection against virulent challenge
Barasona García-Arévalo, José Ángel
Kosowska, Aleksandra
González-García, Gabriela
Díaz De Frutos, Marta
Franzoni, Giulia
Nicolussi, Paola
Porras, Nestor
Sánchez-Segovia, Mónica
De Antonio-Gómez, Daniel
Rueda, Paloma
Barroso Arévalo, Sandra
African swine fever (ASF) continues to expand worldwide. Recent detection in wild boar in Spain highlights the urgent need for effective control tools, with oral vaccination as a key priority. Following previous evaluation of the attenuated Lv17/WB/Rie1 strain, we assess an improved derivative, Lv17/WB/Rie1-ΔCD, lacking EP402R (CD2v) and EP153R, replaced by GFP to abrogate haemadsorption and enable Differentiating-Infected-from-Vaccinated-Animals (DIVA) diagnostics. Vaccinated animals received either a single high dose (104 TCID₅₀) or a prime and re-exposure regimen (102 TCID₅₀ plus a 104 TCID₅₀). Animals were challenged intramuscularly with the virulent Armenia07 genotype II strain. The ΔCD vaccine was well tolerated, inducing only transient low-grade fever. Prime-re-exposure vaccination induced earlier seroconversion (mean 12 ± 4 dpv) and sterilizing immunity in 5/6 animals in the high dose group. Overall protection reached 90%, while all unvaccinated controls died within 7 days. Quantitative PCR revealed >10³-fold reductions in viral genome copies in blood and tissues versus controls. DIVA ELISA reliably distinguished vaccine-induced antibodies from infection-derived responses. These findings identify Lv17/WB/Rie1-ΔCD as a safer oral ASFV vaccine candidate, addressing concerns raised with the parental Lv17/WB/Rie1 by increasing attenuation and supporting multi-gene deletion strategies. Further studies on safety, transmission, genetic stability, and environmental behaviour are required before large-scale field trials
2026-04-15T15:28:09Z
2026-04-15T15:28:09Z
2026-04-15T15:28:09Z
2026
journal article
https://hdl.handle.net/20.500.14352/134807
0165-2176
10.1080/01652176.2026.2649573
1875-5941
eng
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CPP2023-010878/ES/Transferencia de la vacunación oral frente a la peste porcina africana (PPA) en jabalí para mitigar la introducción en países libres de PPA: fase de prueba final y aceptabilidad en campo (WildASF-Vax)/
CNS2025-166676
MICIU/AEI/10.13039/501100011033
RYC2022-038060-I
CT2/25
Barasona, J. A., Kosowska, A., González-García, G., Díaz-Frutos, M., Franzoni, G., Nicolussi, P., Porras, N., Sánchez-Segovia, M., De Antonio-Gómez, D., Rueda, P., & Barroso-Arévalo, S. (2026). A dual-gene-deleted ASFV Lv17/WB/Rie1-ΔCD candidate administered orally to wild boar confers DIVA-compatible protection against virulent challenge. The veterinary quarterly, 46(1), 2649573. https://doi.org/10.1080/01652176.2026.2649573 Copy
http://creativecommons.org/licenses/by/4.0/
open access
Attribution 4.0 International
Taylor and Francis