Abstract
Dengue viral (DENV) infection has a broad clinical spectrum ranging from classical febrile illness to life-threatening disease. Literature suggests that spectrum of illness could be due to differences in innate immune-responses; however, the knowledge is still at infancy. Amongst the various cells involved in innate immune responses, NK cells play a central role, particularly in anti-viral immunity. Thus in this study we have evaluated the role of NK-cells during acute-DENV infection and its influence on severity of disease, by analyzing activation, cytotoxic receptors, cytolytic granule contents and degranulation markers on NK-cells during different stages of infection. Based on the clinical manifestations and severity of the disease, DENV patients were classified into patients with dengue without warning signs (DF), dengue with warning signs (DFWS) and severe dengue (SD) patients. During acute-DENV infection, though there was no alteration in frequency of NK-cells, significant increase in frequency of CD56bright subset in DF patients (p < 0.05) was observed, while it remained unaltered in SD patients. We also found that, CD56dim NK-cell subset of DF patients had elevated CD69 expression, granzyme B and intracellular IFN-γ lev...Continue Reading
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