An appraisal of some recent diagnostic assays for Japanese encephalitis

Southeast Asian J Trop Med Public Health. 1996 Dec;27(4):673-9.

Abstract

A study was undertaken in South Arcot district of Tamil Nadu, India to assess relative merits of selected diagnostic techniques for Japanese encephalitis. During the transmission seasons of 1993-1995, a total of 85 patients (mostly pediatric) clinically diagnosed as acute encephalitis or other related central nervous system (CNS) disorders were examined; in 53 (62.4%) a laboratory diagnosis of JE was established. In terms of diagnostic value, immunoglobulin M (IgM) antibody capture ELISA (MAC ELISA) on convalescent serum had the highest sensitivity (89%) and negative predictive value (NPV) (50%). This was followed by MAC ELISA on acute serum and CSF which had similar sensitivity (84%) and NPV (40%). The hemagglutination inhibition test and Toxorhynchites splendens inoculation technique for virus isolation were also similar in sensitivity (68%) and NPV (25%). The virus antigen detection technique by IFA in cells of cerebrospinal fluid (CSF) was the least sensitive (58%). The distinct advantage of the acute serum ELISA is that it can be carried out on a single finger-prick blood specimen. The IFA on CSF cells is the most rapid diagnostic test since it requires only 2-3 hours to complete. Therefore, both these tests also offer potential tools for JE surveillance programs.

MeSH terms

  • Adult
  • Child
  • Child, Preschool
  • Encephalitis Virus, Japanese / immunology
  • Encephalitis, Japanese / cerebrospinal fluid
  • Encephalitis, Japanese / diagnosis*
  • Encephalitis, Japanese / immunology
  • Enzyme-Linked Immunosorbent Assay
  • Humans
  • Immunoglobulin M / immunology
  • India
  • Infant

Substances

  • Immunoglobulin M