Related Experiment Video
Updated: Jul 24, 2025
Field Postmortem Rabies Rapid Immunochromatographic Diagnostic Test for Resource-Limited Settings with Further Molecular Applications
Published on: June 29, 2020
Diagnostic Accuracy of Rapid Antibody Detection Test for Scrub Typhus
Doddaiah Narayanappa1, Ravi Geetha1, Hassan Sreenivasamurthy Rajani2
1Department of Paediatrics, JSS Medical College, JSS Academy of Higher Education and Research, Mysore, Karnataka.
Insights
Rapid antibody detection tests using IgM immunochromatography show good diagnostic accuracy for detecting scrub typhus in children with undifferentiated fever. This test is a reliable tool for diagnosing scrub typhus in pediatric patients.
Area of Science:
- Pediatrics
- Infectious Diseases
- Diagnostic Medicine
Background:
- Scrub typhus is a significant cause of acute undifferentiated fever in children, particularly in endemic areas.
- Accurate and rapid diagnosis is crucial for timely treatment and improved outcomes.
- Traditional diagnostic methods can be slow or lack sensitivity and specificity.
Purpose of the Study:
- To evaluate the diagnostic accuracy of a rapid antibody detection test using IgM immunochromatography for scrub typhus in children.
- To compare the performance of this rapid test against established serological methods.
Main Methods:
- A cross-sectional study involving 90 children (2 months-18 years) hospitalized with undifferentiated fever (≥5 days).
- Blood samples were tested using Weil-Felix, Scrub IgM ELISA, immunofluorescence assay (IFA), and rapid diagnostic test (IgM Immunochromatography).
- Immunofluorescence assay (IFA) served as the gold standard for diagnosis.
Main Results:
- The rapid diagnostic test (IgM Immunochromatography) demonstrated high diagnostic accuracy with 88.3% sensitivity and 89.3% specificity.
- Compared to IFA, the rapid test showed comparable performance to IgM ELISA (93% sensitivity, 89.3% specificity).
- Weil-Felix test exhibited lower sensitivity (39.5%) and specificity (84.2%).
Conclusions:
- IgM immunochromatography is a valuable tool for the rapid diagnosis of scrub typhus in children presenting with acute undifferentiated fever.
- The test offers good diagnostic accuracy, aiding in prompt clinical management.
- This rapid test can improve the diagnostic capabilities in resource-limited settings.
Objective:
To detect the diagnostic accuracy of rapid antibody detection test using IgM immunochromatography for scrub typhus in children.
Methods:
This cross-sectional study enrolled children aged 2 months-18 years hospitalized over a period of 18 months with undifferentiated fever of duration five days or more. The blood samples were subjected to serological tests like Weil-Felix, Scrub IgM ELISA, immunofluroscence assay (IFA) and rapid diagnostic test (IgM Immunochromatography). Diagnostic accuracy was measured against IFA as the gold standard.
Results:
A total of 90 children were included in the study, among which 43 children were positive for gold standard test IFA. Rapid diagnostic test showed sensitivity of 88.3%, specificity of 89.3%, positive predictive value of 88.3% and negative predictive value of 89.3%. The sensitivity, specificity, PPV and NPV of Weil-Felix test was 39.5%, 84.2%, 58.6 and 71.1%, respectively and of IgM ELISA was 93%, 89.3%,88.8% and 93.3%, respectively.
Conclusion:
IgM immunochromatography had good diagnostic accuracy for scrub typhus in children with acute undifferentiated fever.
More Related Videos
07:54Author Spotlight: Rabies-Specific Antibody Isotypes Detection in Sera or Cerebral Spinal Fluid Using an IFA Test
Published on: January 19, 2024
07:08A Rapid, Multiplex Dual Reporter IgG and IgM SARS-CoV-2 Neutralization Assay for a Multiplexed Bead-Based Flow Analysis System
Published on: April 6, 2021
