Global Dengue Crisis: New Observatory Aims to Track and Tackle Historic Surge
A new international platform, the Global Dengue Observatory, is now operational, offering monthly monitoring of dengue trends across 88 countries. This initiative arrives as the mosquito-borne disease reached unprecedented levels in 2024, prompting a critical need for improved surveillance and response strategies.
Dengue’s Expanding Reach
Dengue is now endemic in over 100 countries, putting roughly half the world’s population at risk, according to the World Health Organization (WHO). Even as historically concentrated in tropical regions, outbreaks are increasingly occurring in unexpected locations, even at higher altitudes. Latin America currently experiences the highest prevalence, but the virus is demonstrably on the move.
Bridging the Data Gap: Real-Time Insights
A significant challenge in controlling dengue is the delay in reporting cases. Data often takes days or months to reach international databases, underestimating the true scale of infections. The Global Dengue Observatory, developed by the London School of Hygiene &. Tropical Medicine (LSHTM), addresses this by utilizing data from the WHO and LSHTM’s OpenDengue Project. Researchers have designed algorithms to estimate the likely final number of cases, accounting for reporting delays and missing data – currently applied to Latin America, the most affected region.
“When a dengue case occurs, it doesn’t appear in international databases immediately,” explains Katie Milligan Susong, an infectious diseases researcher at LSHTM. “The case must be identified, reported to local health authorities, aggregated at the national level and then shared with international bodies like the WHO.”
Africa’s Rising Risk and the Need for Enhanced Surveillance
Experts believe the observatory will be particularly impactful in Africa, where routine dengue surveillance is still developing. Doris Kemunto Nyamwaya, an LSHTM expert on Africa, notes the platform’s potential to “transform the landscape by providing accessible, real-time insights that can help countries strengthen surveillance, anticipate outbreaks, and shape more effective dengue control policies.”
The Impact of Climate Change and Urbanization
The WHO attributes the dramatic rise in dengue cases – from 505,430 in 2000 to a record 14.6 million in 2024 – to several interconnected factors. These include expanding mosquito habitats, climate change, weak health systems, and political instability. A recent study in Virology Journal highlights how these dynamics are pushing dengue into new environments.
For example, Cochabamba, Bolivia, located 2,550 metres above sea level, experienced its largest outbreak to date in 2024. This is attributed, in part, to the increasing range of the Aedes aegypti mosquito as temperatures rise. The city recorded its highest temperatures on record in spring 2023 and throughout 2024.
Short-Term Immunity and Localized Spikes
While Latin America saw a 66 per cent drop in cases in 2025 (4.4 million cases) compared to the record high in 2024, this decline is largely attributed to short-term immunity following the massive outbreaks of the previous year. However, localized spikes remain a concern. Cuba, Guyana, and Suriname continue to report high infection levels.
The surge in Cuba may be linked to a shift in the dominant dengue serotype, coupled with disruptions to public health services like fumigation and water distribution. Water shortages often force communities to collect water in open containers, creating ideal breeding grounds for mosquitoes.
Guyana and Suriname, sharing a coastal tropical ecology and highly connected populations, similarly face elevated risk due to historically low case numbers and resulting lower population immunity.
The Role of Regional Coordination
Tomás Orduna, an infectious diseases specialist at the Hospital Muñiz in Buenos Aires, believes the observatory could empower authorities to respond more quickly to emerging threats. “It could enable those managing programmes, departments and ministries to make better decisions, particularly when the figures show a worrying or escalating situation,” he says. He also suggests that features facilitating regional comparisons could help neighbouring countries coordinate preventive measures.
Frequently Asked Questions
- What is dengue fever? Dengue is a mosquito-borne viral infection that can cause flu-like illness, and in some cases, develop into severe dengue, which can be life-threatening.
- Where is dengue most prevalent? Dengue is most common in tropical and subtropical regions, with Latin America currently experiencing the highest prevalence.
- How can I protect myself from dengue? Protect yourself from mosquito bites by using insect repellent, wearing long sleeves and pants, and eliminating standing water around your home.
- What is the Global Dengue Observatory? It’s a new platform that provides monthly monitoring of dengue trends across 88 countries, aiming to improve surveillance and response efforts.
Did you know? Dengue cases have risen dramatically in recent decades, increasing from 505,430 in 2000 to 14.6 million in 2024.
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