RT Journal Article T1 A serum cytotoxicity assay for measuring the resistance of turbot to the ciliate Philasterides dicentrarchi A1 Gulías Otero, Paola A1 Sueiro Benavides, Rosa Ana A1 González Barreiro, Óscar A1 Brea Portela, Cristina A1 Macías Sancho, Joaquín A1 Leiro Vidal, José Manuel A1 Lamas Fernández, Jesús K1 Philasterides dicentrarchi K1 Fish K1 Complement system K1 Cytotoxicity K1 Immunization K1 Disease resistance AB In previous studies we have found that the complement system plays an essential role in the resistance of fish to infection by the ciliate parasite Philasterides dicentrarchi. The present study shows that it is possible to predict resistance to P. dicentrarchi in the turbot Scophthalmus maximus by using a complement-dependent serum cytotoxicity assay. Fish were immunised against P. dicentrarchi, and fish mortality following experimental challenge, specific serum antibody levels and serum cytotoxicity were compared. We found a correlation between the results obtained regarding the killing activity of serum and the protection generated in turbot by the vaccine after experimental challenge. The study findings suggest that the serum cytotoxicity assay can be used to assess the protection generated by the vaccine against P. dicentrarchi in turbot, thereby reducing both the number of fish required for the experiments and the pain and distress associated with experimental infection PB Elsevier SN 2950-3116 YR 2025 FD 2025-10-30 LK https://hdl.handle.net/10347/44491 UL https://hdl.handle.net/10347/44491 LA eng NO Guliás P, Sueiro RA, González O, Brea C, Macías J, Leiro JM, Lamas J. (2025). A serum cytotoxicity assay for measuring the resistance of turbot to the ciliate Philasterides dicentrarchi. Comparative Immunology Reports 9 (2025), 200259. doi: https://doi.org/10.1016/j.cirep.2025.200259 NO IDI-20200702 from the Ministerio de Economía, Industria y Competitividad NO 2021-PG042 from the Xunta de Galicia (Spain) NO Programa de Ciencias Mariñas de Galicia (2022-CP084) DS Minerva RD 23 abr 2026