Climate Change Fuels Global Malaria Surge: Seoul Issues First-Ever Alerts as WHO Warns of Rising Cases
Global efforts to eradicate malaria are facing a significant setback as climate change and environmental instability drive a resurgence of the disease. According to the World Health Organization (WHO), global malaria cases reached an estimated 249 million last year, a 6.9% increase—or 16 million additional cases—compared to 2019 levels.
This upward trend is particularly evident in South Korea, where the public health landscape is shifting. Data from the Korea Disease Control and Prevention Agency (KDCA) reveals that malaria cases in the country have more than doubled over the last two years. This surge led to an unprecedented public health response in July 2024, when Seoul issued its first-ever malaria alerts. The city first declared an alert for Yangcheon-gu on July 9, followed by Gangseo-gu on July 22. By August 7, the malaria alert was expanded nationwide.
Experts point to a complex interplay of factors contributing to the rise in cases within South Korea, including climate change, the lingering effects of the COVID-19 pandemic, and the influence of inter-Korean relations. Historically, Korea saw between 300 and 400 cases annually from May to October, primarily concentrated near the Demilitarized Zone (DMZ) in regions such as Seoul, Incheon, Gyeonggi, and Gangwon. However, the recent spike suggests that the region is no longer a safe zone.
The WHO has identified 25 priority countries for malaria eradication by 2030, including South Korea, North Korea, Thailand, Mexico, and Costa Rica. Notably, South Korea is one of only three OECD member nations—alongside Mexico and Costa Rica—on this priority list. The ability to meet these targets depends heavily on monitoring and rapid response. in Korea, malaria alerts are triggered when cluster cases emerge or when mosquito traps record five or more malaria-carrying mosquitoes daily for two consecutive weeks.
On a global scale, the WHO report highlights that while some progress has been made—with the number of countries reporting fewer than 1,000 cases growing from 13 in 2000 to 34 last year—other regions are seeing dangerous spikes. Countries such as Nigeria, Ethiopia, Uganda, and Papua Fresh Guinea have seen significant increases. The impact of climate-driven natural disasters is most evident in Pakistan, where malaria cases surged fivefold last year following devastating floods.
The global increase is further complicated by the aftermath of the pandemic. The WHO noted that during 2020 and 2021, international medical resources were heavily diverted to combat COVID-19, hindering the fight against other infectious diseases. Even as COVID-19 mortality rates have declined and vaccine distribution has expanded, malaria rates continue to climb, underscoring the persistent threat posed by environmental shifts.
As malaria is an acute febrile infectious disease transmitted via the bites of mosquitoes infected with Plasmodium parasites, the expanding reach of these vectors poses a critical challenge to international health security. The current data suggests that climate change and malaria expansion require urgent, coordinated responses to prevent further outbreaks in previously stable regions.
These findings emphasize that achieving the 2030 eradication goal will require more than just medical interventions like vaccines and insecticide-treated nets; it will necessitate addressing the environmental drivers that allow mosquito populations to thrive in new territories.
