Anti-Dengue Virus Antibody Avidity Correlates With Protection Against Symptomatic Dengue Virus Infection.

Area of Science:

• Immunology
• Virology
• Epidemiology

Background:

• Antibody avidity reflects immune system maturation after infection or vaccination.
• Dengue virus (DENV) poses a significant global health challenge, with secondary infections often being more severe.

Purpose of the Study:

• To investigate the relationship between pre-existing anti-DENV antibody avidity and the outcome of secondary DENV exposure.
• To determine if antibody avidity can predict symptomatic versus inapparent DENV infections.

Main Methods:

• Assessed anti-DENV antibody avidity using the avidity index (antibody response/dissociation rate).
• Analyzed sera from participants in the Nicaraguan Pediatric Dengue Cohort Study before secondary DENV infections.
• Utilized risk factor analysis to correlate avidity index with infection outcomes.

Main Results:

• The avidity index was significantly higher in participants who developed inapparent DENV infections compared to those with symptomatic infections.
• Increased avidity index was associated with a higher likelihood of inapparent DENV infection.

Conclusions:

• Pre-existing antibody avidity is a significant predictor of secondary dengue infection outcomes.
• Higher antibody avidity index may indicate a more protective immune response against symptomatic DENV infection.