Cold Damage (傷寒)
In Han Chinese medicine, a family of fever illnesses believed to begin when cold invades the body from outside. Historians cannot match it to one modern disease.
Preface to the Treatise on Cold Damage
Zhang Zhongjing, Treatise on Cold Damage and Miscellaneous Diseases, preface · c. 200–206 (within ten years of the start of the Jian'an era, 196)
[11]
余宗族素多向餘二百建安紀年以来猶未十稔其死亡者三分有二傷寒十居其七
My clan was once large, more than two hundred people. Yet in the less than ten years since the Jian'an era began, two out of every three of us have died, and seven out of ten of those deaths came from Cold Damage.