Secondary Dengue Infection Elicits Earlier Elevations in IL-6 and IL-10 Levels.

Area of Science:

• Virology
• Immunology
• Infectious Diseases

Background:

• Dengue virus (DENV) infection presents diverse clinical manifestations.
• Cytokine profiles, including interleukin-6 (IL-6) and interleukin-10 (IL-10), are crucial in DENV pathogenesis.
• Understanding cytokine kinetics during the febrile stage is vital for predicting disease severity.

Purpose of the Study:

• To investigate the dynamic changes in IL-6 and IL-10 levels during the febrile stage of DENV infection.
• To compare cytokine kinetics between primary and secondary DENV infections.
• To explore the correlation between cytokine levels and clinical parameters.

Main Methods:

• Analysis of IL-6 and IL-10 levels in viremic dengue patients.
• Categorization of patients into Phase I (early febrile) and Phase II (late febrile) based on anti-DENV IgM.
• Comparison of cytokine profiles in primary versus secondary infections and correlation with clinical data (platelets, AST, hospitalization).

Main Results:

• Secondary DENV infections (38.2% of cases) showed earlier elevations of IL-6 and IL-10 compared to primary infections.
• Elevated IL-6 and IL-10 levels correlated with thrombocytopenia and elevated AST, particularly in Phase II and secondary infections.
• Cytokine levels were linked to clinical manifestations and hospitalization risk.

Conclusions:

• IL-6 and IL-10 kinetics differ significantly between primary and secondary DENV infections.
• Early cytokine elevation in secondary infections suggests a role for immune memory.
• Cytokine dynamics provide insights into DENV pathogenesis and clinical outcomes, warranting further investigation with broader panels.