# Vector (Biological Weapons Law) **Entity class:** Statutory biological-weapons concept Under 18 U.S.C. §178, a **vector** is a living organism or molecule capable of carrying a biological agent or toxin to a host. The definition can include a human carrier when those biological conditions are met. It does not extend to ideological content. ## Relationships [[wiki/Human as WMD Vector|Human as WMD Vector]] · [[wiki/Biological Agent|Biological Agent]] · [[wiki/Memetic Vector|Memetic Vector]] ## Sources - [18 U.S.C. §178 — biological-weapons definitions](https://uscode.house.gov/view.xhtml?edition=2023&num=0&req=granuleid%3AUSC-2023-title18-section178) **As of:** 2026-09-23