Found this to be an interesting story. A Scottish women named Joy Milne says she can smell Parkinson's. She is a former nurse and her husband developed the illness. Milne says she noticed the smell of Parkinson's ten years before her husband was diagnosed with the illness. After going to a Parkinson's meeting, she knew what the smell was. A research group at the University of Manchester has tested her ability to detect patients with Parkinson's, successfully. They are now trying to develop a diagnostic test so the illness can be diagnosed sooner. Here's a BBC video on Milne from last year: And a short article by the Guardian about a recent paper on the development of the test (by Tom Fielden) https://www.theguardian.com/society...elps-develop-swab-test-for-parkinsons-disease [EDIT: The publication is Triverdi et al. (2019). Discovery of Volatile Biomarkers of Parkinson’s Disease from Sebum.] This may sound weird, but I would very much want Joy Milne to smell me... Not for Parkinson's, but who knows that ME/CFS has its own odor?