An Exploratory Study of AVI-4020 in Patients With Possible Acute Neuroinvasive West Nile Virus (WNV) Disease

Although the serious form of West Nile Virus (WNV) disease, referred to as neuroinvasive disease, is rare, it can result in permanent disabilities and occasionally death. For patients who get this serious form of WNV disease, there are no approved specific treatment options. The purpose of this study is to test a new drug, AVI-4020 Injection, in patients who are hospitalized with recent symptoms of this form of WNV disease. In this study, we will determine if the AVI-4020 treatment is safe. This will be accomplished by reviewing the results of laboratory tests and clinical signs and symptoms. Additionally, we will review the patient data for signs that AVI-4020 is providing any beneficial effects against WNV neuroinvasive disease.

1. To evaluate the safety of intravenously administered (IV) AVI-4020 Injection every 12 hours for a total of ten doses over the course of study surveillance. 2. To evaluate the tolerability of intravenously administered AVI-4020 Injection every 12 hours for a total of ten doses over the course of study surveillance. 3. To evaluate the effectiveness of intravenously administered AVI-4020 Injection at 45 mg every 12 hours for ten doses, based on the neurological status of each study Subject as measured by a combination of the NIH stroke scale score and the Glasgow coma scale score. 4. To evaluate the robustness of the potential effectiveness of intravenously administered AVI-4020 Injection every 12 hours for ten doses over the course of 35 days of active surveillance, based on a variety of criteria, e.g., clinical, laboratory and/or neurophysiological results.