Convalescent Plasma for the Treatment of Patients With WNV - a Double- Blind Randomized Controlled Study

Inclusion Criteria: * Hospitalized patients with positive WNV-PCR with fever/neurological symptoms, and 72 hours have not yet passed since the positive result. * Age 60 or older. * Age over 18 and younger than 60 with immunosuppression (hypogammaglobulinemia, solid organ transplants, bone marrow transplants, hemato-oncological malignancies). Exclusion Criteria: * Age younger than 60 without immunosuppression. * More than 72 hours have passed since the diagnosis of West Nile fever. * Pregnant women. Criteria for exclusion from the experiment: none Reference to the inclusion of pregnant women, special populations - children and those lacking judgment- not relevant: excludes pregnant women and special populations