This monoclonal antibody provides sensitive, specific detection of Severe Fever with Thrombocytopenia Syndrome (SFTS) virus, an emerging tick‑borne pathogen of growing public health concern. Clone 11H12 delivers strong affinity and low background in ELISA, Western blotting, and antigen‑capture assays, enabling precise detection in serum, culture supernatants, and purified viral antigen preparations. MSFTS‑55A‑11H12 is ideal for diagnostic development, surveillance research, and studies examining SFTS viral pathogenesis. Its consistent performance ensures reliable detection across diverse assay formats.