A Michigan State University study provides further evidence that a simple scratch-and-sniff test could predict Parkinson’s disease even earlier than previously thought, reports News Medical.

Honglei Chen, lead author and professor of epidemiology, Michigan State University, this test could identify the persons at risk of developing Parkinsonism at least a decade before it can be actually diagnosed. Sense of smell has been associated with the progression of this disease in the past but this is the first study of its kind that shows the predictive value of a simple test.

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