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Utility of IgM ELISA, TaqMan real‐time PCR, reverse transcription PCR, and RT‐LAMP assay for the diagnosis of Chikungunya fever
Author(s) -
Reddy Vijayalakshmi,
Ravi Vasanthapuram,
Desai Anita,
Parida Manmohan,
Powers Ann M.,
Johnson Barbara W.
Publication year - 2012
Publication title -
journal of medical virology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 121
eISSN - 1096-9071
pISSN - 0146-6615
DOI - 10.1002/jmv.23406
Subject(s) - virology , chikungunya , taqman , real time polymerase chain reaction , reverse transcription polymerase chain reaction , biology , reverse transcriptase , virus , medicine , polymerase chain reaction , gene , genetics , messenger rna
Chikungunya fever a re‐emerging infection with expanding geographical boundaries, can mimic symptoms of other infections like dengue, malaria which makes the definitive diagnosis of the infection important. The present study compares the utility of four laboratory diagnostic methods viz. IgM capture ELISA, an in house reverse transcription PCR for the diagnosis of Chikungunya fever, TaqMan real‐time PCR, and a one step reverse transcription‐loop mediated isothermal amplification assay (RT‐LAMP). Out of the 70 serum samples tested, 29 (41%) were positive for Chikungunya IgM antibody by ELISA and 50 (71%) samples were positive by one of the three molecular assays. CHIKV specific nucleic acid was detected in 33/70 (47%) by reverse transcription PCR, 46/70 (66%) by TaqMan real‐time PCR, and 43/70 (62%) by RT‐LAMP assay. A majority of the samples (62/70; 89%) were positive by at least one of the four assays used in the study. The molecular assays were more sensitive for diagnosis in the early stages of illness (2–5 days post onset) when antibodies were not detectable. In the later stages of illness, the IgM ELISA is a more sensitive diagnostic test. In conclusion we recommend that the IgM ELISA be used as an initial screening test followed one of the molecular assays in samples that are collected in the early phase of illness and negative for CHIKV IgM antibodies. Such as approach would enable rapid confirmation of the diagnosis and implementation of public health measures especially during outbreaks. J. Med. Virol. 84:1771–1778, 2012. © 2012 Wiley Periodicals, Inc.