Usutu virus (USUV) is an emerging mosquito-borne flavivirus known to induce neuroinvasive disease in birds, mice, and humans in European and African countries. The mechanisms of infection and dissemination remain poorly understood. Thus, elucidating how USUV spreads in a susceptible host is crucial for identifying therapeutic targets. To investigate host defenses against USUV, we generated an infectious clone of the TC508 isolate. After characterizing its replication dynamics in cultured cells from multiple species, we investigated its pathogenesis in an array of mice with genetic perturbations.
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