Wú Yǒuxìng 吳有性 (zì Yòukě 又可, 1582–1652, 明), late-Míng physician of Zhènzé 震澤 (modern Wújiāng 吳江, Jiāngsū). The founder of the Chinese Wēnyì 瘟疫 (warm-epidemic) school of medicine. Author of the foundational Wēnyì lùn 瘟疫論 (KR3e0087, 2 juan + 1 juan supplement, completed Chóngzhēn rénwǔ = 1642). Wú composed the work in response to the great Chóngzhēn xīnsì (1641) epidemic that swept through Northern and Southern Zhílì, Shāndōng, and Zhèjiāng simultaneously, killing many — when conventional Shānghán (cold-damage) treatment proved ineffective. His doctrinal innovation: that wēnyì is fundamentally different from Shānghán — entering through the mouth and nose rather than through the surface of the body, lodging in the Móyuán 膜原 (membranous-source) intermediate space (neither external nor internal), and following 9 distinctive transmission patterns. The work is the foundation of the Qīng-period Wēnbìng school (Yè Tiānshì 葉天士, Xuē Xuě 薛雪, Wú Jūtōng 吳鞠通, Wáng Mèngyīng 王孟英), which became the principal Qīng-period therapeutic framework for epidemic febrile diseases — a lineage extending to the modern TCM treatment of viral and bacterial infections including SARS (2003) and COVID-19 (2020).