Publication date: Oct 05, 2025

Editors have highlighted the following attributes while ensuring the content’s credibility:An Aedes aegypti mosquito with red powder used to mark the animal in a behavior test. That unpredictability is what makes public health planningand vaccine developmentso difficult. “Local conditions matterthings like housing quality, mosquito density and how communities respond. “You can have one outbreak that infects just a few people, and another in a similar setting that infects tens of thousands. Credit: Matt Cashore/University of Notre DameThe symptoms come on quicklyacute fever, followed by debilitating joint pain that can last for months. This article has been reviewed according to Science X’s editorial process and policies . Some variation is simply due to chance.

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