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Development of a serodiagnostic IgM-ELISA for tick-borne encephalitis virus using subviral particles with strep-tag.

Tick-borne encephalitis virus (TBEV) is a zoonotic agent causing severe encephalitis in humans. IgM antibody detection is useful for the serological diagnosis of TBEV infection, because IgM has high specificity for each flavivirus and indicates a recent infection. Commercial IgM-ELISA kits are somewhat expensive and difficulties in their sensitivity have been suggested due to their format and formalin-inactivated antigens. Therefore, the development of an inexpensive IgM-ELISA with high specificity and sensitivity is needed. In this study, a μ-capture ELISA was developed to detect TBEV-specific IgM antibodies using subviral particles (SPs) with strep-tag (strep-SP-IgM-ELISA). The results of our strep-SP-IgM-ELISA were highly correlated with diagnoses made by the neutralization test (sensitivity: 94.1%), and our strep-SP-IgM-ELISA could detect anti-TBEV IgM antibodies in patients who could not be diagnosed with the neutralization test. Besides, 51 of 52 positive samples by a commercial IgM-ELISA were also diagnosed as positive by our strep-SP-IgM-ELISA (98.1%), and our strep-SP-IgM-ELISA could detect anti-TBEV IgM antibodies in all samples that were inconclusive based on the commercial IgM-ELISA. Our strep-SP-IgM-ELISA will be useful for diagnoses in TBE-endemic areas.

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