ArticleTropical medicine and health2025
Sustained humoral immunity in the patients recovered from severe fever with thrombocytopenia syndrome.
Article in Tropical medicine and health, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundSevere fever with thrombocytopenia syndrome (SFTS) is a tick-borne viral disease with a mortality rate of 10-30%; however, effective vaccines and therapies for this disease have not yet been developed. Understanding the long-term immune response of recovered individuals is critical for vaccine development and treatment. In this study, we conducted an epidemiological investigation of antibody and memory B cell trends in individuals with SFTS.
methodsPeripheral blood mononuclear cells (PBMCs) and plasma were collected from 16 survivors of SFTS and five healthy controls. SFTS virus (SFTSV)-specific humoral immune responses were assessed using enzyme-linked immunosorbent assay (ELISA), biolayer interferometry (BLI), neutralization assays, and flow cytometry.
resultsSFTSV Gn-specific IgG was detected in plasma samples from all patients using ELISA and BLI. All patient plasma samples also presented neutralizing activity against SFTSV infection, and the IC₅₀ values were correlated with ELISA OD values (ρ = 0.700, P = 0.003 and BLI signals (ρ = 0.818, P = 0.0002). Neutralizing antibodies and SFTSV Gn-specific memory B cells were detected in samples from patients up to 6.7 years post-infection.
conclusionSFTSV-specific humoral immunity, including neutralizing antibodies and memory B cells, can persist in the majority of recovered patients, including those as late as 6.7 years post-infection. This information will be useful for the development of vaccines and antiviral therapies using antibodies against SFTS.
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