A new long-term study has revealed that climate change is intensifying dengue fever transmission across Indonesia, signaling a growing public health threat for one of the world’s largest dengue-endemic nations. Published on ScienceDirect (October 2025), the 14-year analysis links rising temperatures, erratic rainfall, and higher humidity to the increasing frequency and severity of dengue outbreaks throughout the archipelago.
The research, led by KA Akbar and colleagues, provides compelling evidence that climate change is not merely an environmental issue but a pressing health risk for millions of Indonesians. By comparing meteorological trends with national dengue surveillance data, the study identifies climate variability as a major driver of dengue escalation—one that will continue to worsen without targeted adaptation strategies.
Rising Temperatures Accelerate Mosquito Growth
One of the study’s most urgent findings is the significant impact of higher temperatures on Aedes aegypti, the primary vector of dengue. Warmer conditions speed up the mosquito’s reproductive cycle and increase its feeding activity. At the same time, the dengue virus replicates faster inside the mosquito under elevated temperatures, making transmission more efficient.
“Even small increases in temperature can sharply elevate dengue transmission risk. Warmer conditions shorten the virus’s incubation period inside the mosquito, allowing faster and broader spread,” explained lead researcher KA Akbar.
Erratic Rainfall Expands Breeding Sites
Indonesia’s shifting rainfall patterns—marked by more frequent heavy downpours and unpredictable wet seasons—also play a key role in rising dengue cases. Prolonged or extreme rainfall events create stagnant water sources that serve as breeding grounds for mosquitoes, especially in densely populated urban neighborhoods with inadequate drainage.
During drier periods, water storage practices in open containers further increase mosquito breeding sites, making dengue a year-round threat rather than a seasonal one.
“Previously, dengue peaks were concentrated around the early rainy season. Now, outbreaks can occur at almost any time due to unstable climate conditions,” Akbar noted.
Higher Humidity Extends Mosquito Lifespan
Beyond temperature and rainfall, humidity has emerged as another powerful determinant of dengue risk. The study reports that higher humidity levels—now more common due to climate-driven atmospheric changes—enable mosquitoes to survive longer. With extended lifespans, mosquitoes have more opportunities to bite humans and transmit the virus, prolonging the transmission season across multiple regions.
“Humidity is an underestimated factor. When humidity rises, mosquitoes can live significantly longer, greatly increasing the chances of dengue transmission,” Akbar stated.
A concerning trend highlighted in the study is the expansion of dengue risk into areas previously considered low-risk. Climate change appears to be making new regions more suitable for Aedes aegypti survival and breeding.
“We are seeing a geographic expansion of dengue risk. Areas once considered safe are now reporting higher case numbers. This is a direct consequence of shifting climate conditions,” said Akbar.
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Health System Faces Growing Pressure
Indonesia’s healthcare system already faces significant strain each year from dengue outbreaks, particularly in major cities such as Jakarta, Surabaya, and Bandung. With climate conditions now favoring longer and more frequent transmission periods, the burden on hospitals and public health resources is expected to intensify.
The study urges policymakers to incorporate climate-sensitive strategies into dengue control efforts. Among its recommendations are climate-based early warning systems capable of predicting outbreak risks using real-time weather data. Such tools could help health authorities allocate resources faster and more effectively ahead of high-risk periods.
Akbar emphasizes that traditional dengue control tactics—such as fogging, larvicide distribution, and community cleanup efforts—are no longer sufficient on their own.
“Dengue control can no longer rely solely on conventional vector-control measures. We must integrate climate data into every level of intervention if we want to stay ahead of the disease,” he warned.
The researchers stress the need for collaboration across multiple sectors, including climatology, epidemiology, urban development, and public health planning. Without coordinated adaptation measures, Indonesia may face even larger and more destructive dengue outbreaks in the years to come.
As global temperatures continue to rise and weather patterns become increasingly unstable, the study serves as a stark reminder: dengue fever is becoming more dangerous, and climate change is accelerating its spread. Stronger, climate-responsive health policies will be essential to protect Indonesia’s population from the growing threat. (Sulung Prasetyo)
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