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Characteristics of progressive multifocal leukoencephalopathy clarified through internet-assisted laboratory

Kazuo Nakamichi1, Hidehiro Mizusawa, Masahito Yamada

  • 1Department of Virology 1, National Institute of Infectious Diseases, Toyama, Shinjuku-ku, Tokyo, 162-8640, Japan.

BMC Neurology
|October 17, 2012
PubMed
Abstract

Insights

This study utilized an internet-assisted surveillance program to characterize progressive multifocal leukoencephalopathy (PML) in Japan. The findings highlight PML

Area of Science:

  • Neuroscience
  • Virology
  • Epidemiology

Background:

  • Progressive multifocal leukoencephalopathy (PML) is a rare, fatal demyelinating disease caused by the JC virus (JCV).
  • PML predominantly affects immunocompromised individuals with diverse underlying conditions, complicating nationwide surveys.
  • Characterizing PML epidemiology is crucial for understanding disease patterns and patient risk factors.

Purpose of the Study:

  • To elucidate the epidemiological characteristics of PML in Japan.
  • To establish and evaluate an internet-assisted laboratory surveillance program for PML.
  • To create a real-time database of PML cases and associated clinical information.

Main Methods:

  • An internet-assisted laboratory surveillance system was developed for PML diagnosis.
  • Real-time PCR assay of JC virus (JCV) DNA in cerebrospinal fluid (CSF) was employed.
  • Clinical data and CSF JCV loads were collected via questionnaires and analyzed.

Main Results:

  • Over 4 years, 419 CSF specimens were tested, identifying 48 PML cases.
  • PML occurred in HIV-positive patients (33.3%) and those with hematologic disorders (39.6%).
  • Males predominated in both HIV-associated (100%) and hematologic (89.5%) PML cases; CSF JCV loads showed no significant differences.

Conclusions:

  • Internet-assisted surveillance is a viable strategy for real-time PML data collection in Japan.
  • The generated database offers valuable insights for diagnosing and managing PML in at-risk populations.
  • This approach aids in understanding PML's national prevalence and characteristics.

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