Veterinarians have been using an antibody product to treat West Nile virus (WNV) clinical signs, but its use for this purpose is currently off-label (not approved by the USDA). Currently, the hyperimmune plasma product HiGamm-Equi, by Lake Immunogenics, is being examined by the USDA for conditional approval.

HiGamm-Equi is typically used for failure of passive transfer in foals--the

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