The Sweating Sickness Reconsidered: Olfactory Entry Route and Architectural Extinction in a Rodent-Borne Hyperacute Encephalitis

Abstract

The English sweating sickness (sudor anglicus) appeared in five explosive epidemics between 1485 and 1551 and then vanished, never to be conclusively identified. Its defining features—onset to death within hours, profuse sweating, terror, headache, and a striking inverse socioeconomic gradient in which the wealthy died preferentially—have defeated every proposed etiology. We do not propose a new pathogen: a rodent-borne (hantaviral) origin has been suggested before and was challenged in 2025 precisely because hantaviruses typically affect rural, agricultural populations "irrespective of social standing," which seems to contradict the disease's preference for the Tudor elite. We propose instead a new mechanism that resolves this objection and several others. Our central claim is that the route of viral entry, not merely the level of exposure, determined the disease's presentation. Sleeping at floor level on thick, infrequently changed rush matting—a practice concentrated in the sealed, poorly ventilated homes of the English elite—delivered aerosolized rodent excreta directly to the olfactory epithelium, providing a documented neural shortcut through the cribriform plate that bypasses the blood–brain barrier and produces primary CNS disease. The same pathogen acquired by respiratory or dermal routes in better-ventilated settings would present as a milder, differently-recognized illness. This single mechanism explains the inverse class gradient, the hyperacute neurological course, the cyclical timing (rodent mast-year dynamics under documented climate forcing), the English geographic concentration, the apparent "disappearance" (architectural change—chimneys, upper floors, and curtained beds—renovated the transmission niche out of existence rather than the pathogen going extinct), and the later French "Picardy sweat," which struck precisely those who "slept close to the ground." We outline falsifiable predictions in ancient DNA, dendrochronology, and parish-record analysis. The mechanism is, to our knowledge, novel and directly answers the standing objection that has caused the rodent-borne hypothesis to be rejected.

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