What percentage of dengue cases are linked to warming?

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Nineteen Percent of Global Dengue Cases Linked to Warming Temperatures

Nearly one-fifth, or 19 percent, of the record number of dengue cases recorded worldwide this year are attributable to climate warming that has already occurred. This finding emerges from research seeking to quantify the direct health impacts of rising global temperatures, particularly in the context of disease transmission. Dengue, a viral illness transmitted by mosquitoes, thrives in specific temperature ranges, and as the planet warms, the conditions for its spread are becoming more favourable in a wider geographic range.
Climate Change's Contribution to Dengue Incidence

A US research team's analysis, which examined dengue infections in 21 countries across Asia and the Americas, found that approximately 19 percent of current dengue cases globally can be linked to pre-existing climate warming. This figure highlights a direct correlation between rising temperatures and the increased incidence of the disease. The study's findings were presented at the annual meeting of the American Society of Tropical Medicine and Hygiene.
Ideal Temperature Range for Dengue Transmission

Temperatures between 20 and 29 degrees Celsius are considered ideal for the proliferation and spread of dengue. As global temperatures rise, areas that were previously too cool are now entering this optimal range. This environmental shift is a significant factor in the expanding geographic reach of dengue.
Projected Increase in Dengue Cases

The research indicates a concerning future trend for dengue transmission. Elevated regions in Peru, Mexico, Bolivia, and Brazil are projected to experience significant increases in dengue cases, potentially rising by as much as 200 percent within the next 25 years, as these areas warm into the ideal temperature range. This projection suggests that at least 257 million people currently reside in areas where global heating could lead to a doubling of the dengue rate over the coming decades.
Record Dengue Cases in 2024

The current year has seen an alarming surge in dengue cases globally. As of September, more than 12.7 million dengue cases were officially recorded worldwide, nearly doubling the previous record total from 2023. While under-reporting is acknowledged, with real numbers possibly closer to 100 million, the official figures underscore the escalating public health challenge posed by the disease.

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What percentage of dengue cases are linked to warming?

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