Climate crisis fuels Surge in Yellow Fever, Dengue Cases Globally
The escalating climate crisis is directly exacerbating the spread of infectious diseases like yellow fever and dengue, pushing outbreaks beyond conventional tropical zones and into temperate regions such as Europe, experts warned at the Cop30 climate summit. A dramatic rise in cases this year underscores the urgent need for global health preparedness and intensified climate action.
The Pan American Health Institution reports 356 confirmed cases of yellow fever in South America so far in 2024, resulting in 152 deaths, primarily concentrated in the Amazon region. This represents the highest annual case count for the continent since 1960, surpassed only by one previous year. Simultaneously, Brazil is experiencing one of its worst years on record for dengue fever, with nearly 6.5 million cases and approximately 5,000 fatalities reported throughout 2024.
The threat isn’t limited to South America. Last year saw a startling surge in dengue cases in Europe, with 304 reported infections – exceeding the total number of cases recorded in the previous 15 years combined.This expansion of mosquito-borne illnesses highlights a concerning trend: the climate crisis is not a future threat, but a present-day public health emergency.
Both yellow fever and dengue are transmitted by the Aedes species of mosquito, which flourish in warmer temperatures and increased humidity – conditions becoming more prevalent due to climate change. The m Health Action Plan, spearheaded by the Brazilian government and the World health Organization, will focus on bolstering surveillance, disseminating best practices, and enhancing capacity building to help nations confront climate-fueled health challenges. A coalition of 35 philanthropic organizations has pledged $300 million in funding to support this initiative.
“Humanity can only win this global climate fight if we connect stronger climate actions to people’s top priorities in their daily lives,” Stiell emphasized. “And there are few higher priorities than our health.”
Though, advocates and health professionals caution that substantially more action is required to mitigate the consequences of escalating temperatures and increasingly frequent extreme weather events.former U.S.Vice President Al Gore revealed on Wednesday that recent data indicates rising heat is causing approximately one death per minute globally, demonstrating a clear failure by governments to adequately address the direct human harm caused by the climate crisis. “How long are we going to stand by… keep turning the thermostat up so that these sort of events get even worse?” Gore questioned.
Several factors are contributing to the expansion of infectious diseases,including deforestation for agricultural and residential advancement,which brings humans into closer contact with animals carrying zoonotic diseases. As one expert at the Belém gathering explained,”It’s globalization as well and it’s also the fact that mosquitoes are smart and so are bacteria. And weather it’s bacteria or viruses, they transmit, they’re just smarter than humans in that case because they’re more adapted, and they will adapt to survive. We are much too slow. We know what we need to do about climate change, but we’re not doing anything.”
Organizations like Médecins Sans Frontières (Doctors Without Borders) are increasingly responding to outbreaks of yellow fever in regions like Brazil and the Democratic Republic of Congo, often following severe droughts or floods. Even in countries with established vaccination programs, such as Brazil, distribution can prove challenging.
Rachel vicente, an expert at the health sciences centre at Brazil’s Federal University of Espírito Santo, noted the confluence of factors driving the outbreaks.”We’ve had huge outbreaks of dengue and an increase in yellow fever even outside of the Amazon region because of lots of rain and high temperatures, which makes the mosquitoes bite more and affects the reproduction of virus in the mosquitoes,” she said. “People are living near more breeding sites, too, especially in urban areas of Brazil. It’s a perfect storm and it’s not just a problem of tropical areas any more, we’ve had outbreaks in Europe as it is indeed getting warmer there and is becoming easier for the vector.”
Vicente stressed the need for increased international collaboration on resilience,arguing that all countries must now prepare for these challenges,not just those traditionally considered at risk. The escalating health crisis serves as a stark reminder that addressing the climate crisis is not merely an environmental imperative, but a fundamental requirement for safeguarding global public health.
