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Highly pathogenic avian influenza A (H5N1) viruses cause severe and often fatal disease in humans. We evaluated the efficacy of repeated intravenous dosing of the neuraminidase inhibitor peramivir against highly pathogenic avian influenza virus A/Vietnam/UT3040/2004 (H5N1) infection in cynomolgus macaques. Repeated dosing of peramivir (30 mg/kg/day once a day for 5 days) starting immediately after infection significantly reduced viral titers in the upper respiratory tract, body weight loss, and cytokine production and resulted in a significant body temperature reduction in infected macaques compared with that of macaques administered a vehicle (P &lt; 0.05). Repeated administration of peramivir starting at 24 h after infection also resulted in a reduction in viral titers and a reduction in the period of virus detection in the upper respiratory tract, although the body temperature change was not statistically significant. The macaque model used in the present study demonstrated that inhibition of viral replication at an early time point after infection by repeated intravenous treatment with peramivir is critical for reduction of the production of cytokines, i.e., interleukin-6 (IL-6), tumor necrosis factor α, gamma interferon, monocyte chemotactic protein 1, and IL-12p40, resulting in amelioration of symptoms caused by highly pathogenic avian influenza virus infection.

Efficacy of Repeated Intravenous Administration of Peramivir against Highly Pathogenic Avian Influenza A (H5N1) Virus in Cynomolgus Macaques