[Detection of rubella-specific IgM by an immunoenzyme technic]

Area of Science:

• Virology
• Immunology
• Diagnostic Medicine

Background:

• Rubella virus infection requires accurate IgM detection for diagnosis.
• Established methods like sucrose gradient centrifugation are used for rubella IgM testing.
• Enzyme-linked immunosorbent assay (ELISA) offers a potential alternative for rubella IgM detection.

Purpose of the Study:

• To compare the diagnostic accuracy of ELISA with sucrose gradient centrifugation for rubella specific IgM detection.
• To evaluate the reliability of ELISA in identifying rubella IgM positive and negative sera.

Main Methods:

• A comparative study involving 114 serum samples.
• Analysis of rubella specific IgM using both ELISA and sucrose gradient centrifugation techniques.
• Correlation of results between the two diagnostic methods.

Main Results:

• All 28 sera positive for rubella specific IgM by centrifugation were also positive by ELISA.
• Out of 86 sera negative by centrifugation, 6 were equivocal and 2 were positive by ELISA.
• Discordant results (ELISA positive, centrifugation negative) were observed in 8 sera without clear clinical or epidemiological links.

Conclusions:

• ELISA is a sensitive method for detecting rubella specific IgM.
• ELISA may produce false-positive results, necessitating confirmation with immunoglobulin separation techniques.
• Confirmation methods are crucial for validating ELISA-based rubella IgM diagnoses.