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Updated: May 6, 2026

Protocol for Dengue Infections in Mosquitoes A. aegypti and Infection Phenotype Determination

Protocol for Dengue Infections in Mosquitoes A. aegypti and Infection Phenotype Determination

Published on: July 4, 2007

How dengue defies dogma: An extrafollicular tale.

Jordan Polster¹, David R Martinez^1,2

¹Department of Microbial Pathogenesis, Yale School of Medicine, New Haven, CT, USA.

Science Immunology

|May 2, 2025

Summary

Severe dengue triggers an unusual immune response outside lymph nodes. This response is orchestrated by a specialized group of CD4-positive (CD4+) T cells, revealing new insights into dengue pathogenesis.

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Area of Science:

Immunology
Virology
Pathogenesis

Background:

Dengue is a significant global health concern, causing severe illness through complex immune mechanisms.
The typical humoral immune response involves germinal centers within lymphoid tissues.

Purpose of the Study:

To investigate the cellular and spatial characteristics of the acute humoral immune response in severe dengue.
To identify the specific T cell subsets involved in driving this response.

Main Methods:

Analysis of immune cell populations in patient samples.
Characterization of T cell subsets and their interactions with B cells.
Assessment of the location of immune responses within affected tissues.

Main Results:

The acute humoral immune response in severe dengue occurs predominantly in an extrafollicular pattern.
A distinct subset of CD4-positive (CD4+) T cells was identified as the primary driver of this extrafollicular response.
These CD4+ T cells exhibit unique functional properties contributing to antibody production.

Conclusions:

The findings challenge the traditional view of humoral immunity in severe dengue.
This extrafollicular response, mediated by specific CD4+ T cells, represents a key pathogenic mechanism in severe dengue.
Targeting these unique CD4+ T cells could offer novel therapeutic strategies for severe dengue.