For this purpose, European sea bass (Dicentrarchus labrax) DLB-1 and gilthead seabream (Sparus aurata) SaB-1 brain cell lines were infected with Ad5 or Ad5/40 vectors expressing GFP, and we evaluated their capacity for infection by fluorescence microscopy and flow cytometry, as well as their antiviral innate immune response by the transcription of gene markers (irf3 and mx). The gene discussed is MX1; the disease is infection.