Le Van Tuan^1,, Phan Thi Tuyet Nga¹, Trinh Thi Hong Hanh¹, Nguyen Thi Thu Tram¹, Pham Tho Duoc¹

Background: Soluble MHC class I polypeptide-related sequence B (sMICB) has been associated with the development of severity of dengue fever. However, serum sMICB level and relationship with platelets in patients with dengue virus (DENV) infection remain unclear. The aims of this study are to identify soluble MICB serum level and the correlation with platelets counts in patients with dengue virus infection. Methods: A total of 88 patients were confirmed with an acute phase of DENV infection (1–7 days after the onset of illness) based on the result a positive reverse transcriptase-polymerase chain reaction (RT-PCR), or anti-dengue IgM antibodies were used. Serum soluble MICB level was measured by MICB ELISA. Results: Serum soluble MICB (sMICB) levels in dengue virus infected patients were observed a median of 146.3 pg/ml. Serum sMICB was significantly higher in dengue patients with warning signs and severe compared to patients without warning signs. However, no significant difference of sMICB between age groups of dengue patients; and between primary and secondary infection were observed (P > 0.05). The significantly negative correlation between serum sMICB levels and platelet counts was found (Spearman’s rho = -0.34, P = 0.001). Conclusion: Serum sMICB levels might be considered as a potential prognostic biomarker for dengue patients.

dengue fever, dengue virus infection, soluble MHC class I polypeptide-related sequence B