The Department of Defense, through the Defense Health Agency (DHA), is seeking contractors for an Indefinite Delivery/Indefinite Quantity (IDIQ) contract focused on the assessment of host-targeted nanobody therapeutics. The primary objective is to evaluate and refine nanobody therapies using established in vitro porcine blood-brain barrier (BBB) models, develop novel BBB models, and address the challenges of delivering therapeutic payloads into the Central Nervous System (CNS) for neurotropic viral infections. This initiative is critical for advancing therapeutic options against high-priority pathogens, as it aims to overcome the limitations posed by the blood-brain barrier. Interested contractors can contact Grant A. Gratton at grant.a.gratton.civ@health.mil or Emily K. O'Hara at emily.k.ohara.civ@health.mil for further details, with the contract having a five-year ordering period and performance monitored through a Quality Assurance Surveillance Plan (QASP).