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lüll Antiviral activity of favipiravir (T-705) against mammalian and avian bornaviruses Tokunaga T; Yamamoto Y; Sakai M; Tomonaga K; Honda TAntiviral Res 2017[Jul]; 143 (ä): 237-245Bornaviruses, non-segmented, negative-strand RNA viruses, are emerging agents with the potential for causing various types of neurological symptoms. Previous studies have shown that ribavirin, a nucleic acid analog with broad-spectrum antiviral activity, has a potent antiviral effect on infections with a mammalian bornavirus, Borna disease virus (BoDV-1), as well as avian bornaviruses. However, ribavirin-based treatment does not eliminate bornaviruses from persistently infected cells and viral replication resumes after treatment cessation. Therefore, the development of a novel effective anti-bornavirus treatment is needed. To identify such agents, we screened nucleoside/nucleotide mimetics for agents with anti-bornavirus activity. We used Vero cells infected with recombinant BoDV-1 carrying Gaussia luciferase to monitor BoDV-1 replication and found that favipiravir (T-705) is a potent inhibitor of BoDV-1 replication. T-705 suppressed BoDV-1 replication in a dose- and time-dependent manner during the observation period of 4 weeks. Notably, no increase in luciferase activity or in the number of BoDV-1-positive cells was detected in the at least 4 weeks following T-705 removal. Finally, we demonstrated that T-705 effectively suppressed viral replication of both BoDV-1 and an avian bornavirus, suggesting that T-705 may have a strong antiviral activity against a broad range of bornaviruses. Our findings provide a novel and effective option for treating persistent bornavirus infection.|Amides/administration & dosage/*pharmacology[MESH]|Animals[MESH]|Antiviral Agents/administration & dosage/*pharmacology[MESH]|Bird Diseases/virology[MESH]|Borna Disease/drug therapy/virology[MESH]|Borna disease virus/genetics[MESH]|Bornaviridae/*drug effects/genetics[MESH]|Cell Line[MESH]|Chlorocebus aethiops[MESH]|Microbial Sensitivity Tests[MESH]|Pyrazines/administration & dosage/*pharmacology[MESH]|Quail[MESH]|RNA, Viral/analysis[MESH]|Time Factors[MESH]|Vero Cells[MESH]|Viral Load/drug effects[MESH]|Virus Replication/drug effects[MESH] |