Journal
JOURNAL OF CLINICAL VIROLOGY
Volume 61, Issue 2, Pages 189-195Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jcv.2014.07.013
Keywords
Encephalitis lethargica; Postencephalitic parkinsonism; Brain samples; Virus; Paleo-virology; High throughput sequencing
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The emergence of encephalitis lethargica (EL), an acute-onset polioencephalitis of unknown etiology as an epidemic in the years 1917-1925 is still unexplainable today. Questioned by the first descriptor of EL himself, Constantin von Economo, there has been much debate shrouding a possible role of the Spanish HI NI influenza A pandemic virus in the development of EL. Previous molecular studies employing conventional PCR for the detection of influenza A virus RNA in archived human brain samples from patients who died of acute EL were negative. However, the clinical and laboratory characteristics of EL and its epidemiology are consistent with an infectious disease, and recently a possible enterovirus cause was investigated. With the rapid development of high-throughput sequencing, new information about a possible viral etiology can be obtained if sufficient specimens for analysis were still available today. Here, we discuss the implications of these technologies for the investigation of a possible infectious cause of EL from archived material, as well as a prospectus for future work for acquiring viral nucleic acids from these sources. (C) 2014 Elsevier B.V. All rights reserved.
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