Diagnosis by smell?

I imagine dogs which are trained to detect oncoming epileptic fits or certain cancers are using their highly developed sense of smell, so this sounds very plausible and encouraging for some early diagnoses.

They get dogs for sniffing out skin cancers
My FIL used to say you coud detect measles in a poorly child as the had a mousy smell.
Most of us having had kids who were vaccicnated it must be a dying art.
uttely fascinating.

It's good the Drs took this rather odd Parkinsons finding seriously. It could be worth exploring this finding for diagnosing other conditions.

Vaccinated

Regarding dogs and their ability to sniff out cancer. I had a benign cancer on my leg some years ago and my dear old dog did sniff my leg often and then would look up at me. It was partly his interest which made me go to the doctor.