Related Experiment Video
Updated: Jun 4, 2026
A Simple Flow Cytometry Based Assay to Determine In Vitro Antibody Dependent Enhancement of Dengue Virus Using Zika Virus Convalescent Serum
Published on: April 10, 2018
Kinetics of plasma viremia and soluble nonstructural protein 1 concentrations in dengue: differential effects
Huynh T L Duyen1, Tran V Ngoc, Do T Ha
1Oxford University Clinical Research Unit, Churchill Hospital, Oxford, UK.
Insights
Dengue virus (DENV) infection dynamics vary by serotype and immune status. Viremia and nonstructural protein 1 (sNS1) levels differ between primary and secondary DENV infections, impacting clinical outcomes like thrombocytopenia.
Area of Science:
- Virology
- Immunology
- Infectious Diseases
Background:
- Dengue virus (DENV) infection is a significant global health concern.
- Understanding the dynamics of viremia and viral protein levels is crucial for managing dengue.
- Host immune status and DENV serotype influence disease severity.
Purpose of the Study:
- To characterize plasma viremia and nonstructural protein 1 (sNS1) levels in children with acute dengue.
- To investigate the impact of DENV serotype and infection history (primary vs. secondary) on these markers.
- To correlate viremia and sNS1 levels with clinical parameters such as thrombocytopenia and hemoconcentration.
Main Methods:
- Prospective community-based study in Vietnam involving 167 children with acute dengue.
- Sequential collection of plasma samples to measure viremia and sNS1 concentrations.
- Statistical analysis to compare marker levels based on DENV serotype and infection status, and to assess associations with clinical outcomes.
Main Results:
- Plasma viremia was higher and resolved slower in primary than secondary DENV-1 infections.
- Primary DENV-2 and DENV-3 infections showed lower viremia compared to primary DENV-1.
- sNS1 concentrations were higher for DENV-1 than DENV-2, with distinct kinetic profiles in primary vs. secondary infections.
- Higher viremia independently predicted more severe thrombocytopenia and a slight increase in hemoconcentration.
Conclusions:
- DENV serotype and prior immune status significantly influence viremia and sNS1 response dynamics.
- These viral markers are associated with key clinical manifestations of dengue, including thrombocytopenia.
- Findings provide insights into dengue pathogenesis and host-virus interactions.
Abstract:
We describe the magnitude and kinetics of plasma viremia and nonstructural protein 1 (sNS1) levels in sequential samples from 167 children with acute dengue, enrolled early in a community study in Vietnam. All children recovered fully, and only 5 required hospitalization. Among those with dengue virus type 1 (DENV-1), plasma viremia was significantly greater in primary (49) than secondary (44) infections and took longer to resolve. In primary DENV-2 and 3 infections, viremia was significantly lower than among primary DENV-1 infections. Concentrations of sNS1 were significantly higher for DENV-1 than for DENV-2 after adjusting for viremia, with marked differences in the kinetic profiles between primary and secondary infections. Secondary infection and higher viremia were independent predictors of more severe thrombocytopenia, and higher viremia was associated with a small increase in hemoconcentration. Our findings identify clear serotype and immune-status related effects on the dynamics of dengue viremia and sNS1 responses, together with associations with important clinical parameters.
