CNS INFECTIONS: Edited by Adarsh BhimrajHuman prion diseasesWang, Hana; Rhoads, Daniel D.b,c; Appleby, Brian S.a,b,c,dAuthor Information aDepartment of Neurology, University Hospitals Cleveland Medical Center bDepartment of Pathology, National Prion Disease Pathology Surveillance Center cDepartment of Pathology dDepartment Psychiatry, University Hospitals Cleveland Medical Center and Case Western Reserve University, Cleveland, Ohio, USA Correspondence to Han Wang, MD, MPH, 7441 Carole Dr Mentor, OH 44060, USA. Tel: +1 216 392 0608; fax: +1 216 930 5957; e-mail: [email protected] Current Opinion in Infectious Diseases: June 2019 - Volume 32 - Issue 3 - p 272-276 doi: 10.1097/QCO.0000000000000552 Buy Metrics Abstract Purpose of review Prion diseases are rapidly progressive neurodegenerative conditions that can be difficult to diagnose and are transmissible under specific circumstances. The authors will provide background regarding prion disease and focus on diagnostic tools. Recent findings Prion disease is caused by misfolded prion protein. The three possible causes of prion disease include sporadic (85%), genetic (10–15%), and acquired (<1%). Acquired prion diseases include kuru, iatrogenic, and variant Creutzfeldt–Jakob disease. Prion diseases differ in their clinical manifestation, neuropathology, and diagnostic test results. A variety of recent diagnostic tools have evolved that allow more reliable antemortem diagnosis of prion disease such as brain MRI and cerebrospinal fluid real-time quaking-induced conversion. Special infectivity guidelines must be followed when dealing with central nervous system tissue, but only standard precautions are needed for routine clinical care of patients with prion disease. Summary The only way to definitely diagnose prion disease and determine its type is via neuropathologic examination. However, brain MRI and cerebrospinal fluid real-time quaking-induced conversion have drastically increased diagnostic accuracy and are important tests to use when evaluating patients with suspected prion disease. Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.