Development and Evaluation of a New Measles Detection Assay Using Real-Time RT-PCR

Area of Science:

• Virology
• Infectious Diseases
• Public Health

Background:

• Measles virus (MeV) infection severity is reduced by live attenuated vaccines, but vaccination coverage is hindered by access issues and anti-vaccination movements.
• Outbreaks necessitate rapid, transportable diagnostic methods for differential diagnosis of suspected measles cases.
• Current diagnostic limitations require improved sensitivity, especially in early disease stages.

Purpose of the Study:

• To develop and validate a novel real-time quantitative PCR (RT-qPCR) assay for sensitive MeV detection.
• To evaluate the assay's performance compared to ELISA for diagnosing measles.
• To assess the combined diagnostic utility of RT-qPCR and ELISA for measles control.

Main Methods:

• Development of a new RT-qPCR assay for MeV detection.
• Determination of the assay's limit of detection (LOD) on various PCR platforms.
• Clinical validation using 200 samples from suspected measles cases, comparing RT-qPCR with ELISA.

Main Results:

• The RT-qPCR assay demonstrated a limit of detection of 1-1.2 x 10^3 copies/mL.
• ELISA detected 157 positive cases, while RT-qPCR confirmed 163 positive cases out of 200 samples.
• The concordance between RT-qPCR and ELISA was 93%, with RT-qPCR showing higher sensitivity in early disease stages.

Conclusions:

• The developed RT-qPCR assay is a sensitive and promising tool for early measles diagnosis.
• Combining RT-qPCR and ELISA achieves 100% diagnostic sensitivity, vital for controlling MeV contagion.
• RT-qPCR is particularly valuable for detecting MeV before IgM antibodies become detectable by ELISA.