BACKGROUND: The IgM capture ELISA has been the most widely used diagnostic method for Japanese encephalitis. However, the lack of availability of validated commercial kits as well as the short shelf life of the kit reagents has limited the use of this technique to very few centres in Asia. OBJECTIVES: Development and evaluation of a rapid IgM capture ELISA (JEV Chex) in comparison to the conventional IgM capture ELISA. Produce key reagents such as cell culture derived JEV antigen and biotinylated monoclonal antibody which are stable at room temperature. STUDY DESIGN: The conventional IgM capture ELISA was modified to reduce the total assay time and two key reagents used in the assay JEV antigen and biotinylated anti-JEV monoclonal antibodies were rendered stable at room temperature using a special procedure. A multi-centric evaluation of this rapid ELISA was carried out using well characterized stored CSF and serum samples. Long term stability of the key reagents was also assessed over a period of 6 months. RESULTS: The rapid IgM capture ELISA developed by us showed complete concordance with the results obtained using the conventional ELISA at all the three centres where it was evaluated. In addition, the stability studies carried out with the inactivated cell culture antigen and the biotinylated monoclonal antibodies stored at room temperature for a period of 180 days revealed that both these reagents yielded consistent optical density values in the ELISA. CONCLUSIONS: The rapid ELISA format of the IgM capture ELISA (JEV-Chex) developed by us as well as the stability of reagents achieved by us in this study is what renders this rapid IgM capture ELISA very robust and user friendly since reagents can be stored at 4 degrees C by peripheral labs.
BACKGROUND: The IgM capture ELISA has been the most widely used diagnostic method for Japanese encephalitis. However, the lack of availability of validated commercial kits as well as the short shelf life of the kit reagents has limited the use of this technique to very few centres in Asia. OBJECTIVES: Development and evaluation of a rapid IgM capture ELISA (JEV Chex) in comparison to the conventional IgM capture ELISA. Produce key reagents such as cell culture derived JEV antigen and biotinylated monoclonal antibody which are stable at room temperature. STUDY DESIGN: The conventional IgM capture ELISA was modified to reduce the total assay time and two key reagents used in the assay JEV antigen and biotinylated anti-JEV monoclonal antibodies were rendered stable at room temperature using a special procedure. A multi-centric evaluation of this rapid ELISA was carried out using well characterized stored CSF and serum samples. Long term stability of the key reagents was also assessed over a period of 6 months. RESULTS: The rapid IgM capture ELISA developed by us showed complete concordance with the results obtained using the conventional ELISA at all the three centres where it was evaluated. In addition, the stability studies carried out with the inactivated cell culture antigen and the biotinylated monoclonal antibodies stored at room temperature for a period of 180 days revealed that both these reagents yielded consistent optical density values in the ELISA. CONCLUSIONS: The rapid ELISA format of the IgM capture ELISA (JEV-Chex) developed by us as well as the stability of reagents achieved by us in this study is what renders this rapid IgM capture ELISA very robust and user friendly since reagents can be stored at 4 degrees C by peripheral labs.
Authors: Jaimie S Robinson; David Featherstone; Ravi Vasanthapuram; Brad J Biggerstaff; Anita Desai; Nalini Ramamurty; Anwarul Haque Chowdhury; Hardeep S Sandhu; Kathleen F Cavallaro; Barbara W Johnson Journal: Am J Trop Med Hyg Date: 2010-11 Impact factor: 2.345
Authors: Penny Lewthwaite; Ashia Begum; Mong How Ooi; Brian Faragher; Boon Foo Lai; Indunil Sandaradura; Anand Mohan; Gaurav Mandhan; Pratibha Meharwade; S Subhashini; Gulia Abhishek; Asma Begum; Srihari Penkulinti; M Veera Shankar; R Ravikumar; Carolyn Young; Mary Jane Cardosa; V Ravi; See Chang Wong; Rachel Kneen; Tom Solomon Journal: Bull World Health Organ Date: 2010-04-19 Impact factor: 9.408
Authors: Catrin E Moore; Stuart D Blacksell; Thaksinaporn Taojaikong; Richard G Jarman; Robert V Gibbons; Sue J Lee; Vilada Chansamouth; Soulignasack Thongpaseuth; Mayfong Mayxay; Paul N Newton Journal: Am J Trop Med Hyg Date: 2012-07 Impact factor: 2.345