Health
Europe Faces Rising Threat of Tropical Diseases as Mosquito Season Intensifies
As Europe braces for another long, hot summer, public health officials are sounding the alarm over a growing threat: the spread of mosquito-borne diseases typically found in tropical climates. Warmer temperatures driven by climate change and increased global travel have created ideal conditions for viruses such as dengue, chikungunya, and West Nile to gain a foothold across the continent.
According to the European Centre for Disease Prevention and Control (ECDC), locally acquired dengue infections in Europe surged to 304 cases last year—compared to just 201 cases over the previous two years combined. Italy alone accounted for 238 of those infections, marking the largest dengue outbreak ever recorded in the European Union. Meanwhile, France is currently contending with seven active chikungunya outbreaks, indicating an unusually early start to the mosquito season.
“It’s an exponential curve,” said Jan Semenza, environmental epidemiologist at Umeå University in Sweden. “Diseases like dengue and chikungunya could become endemic in Europe if trends continue.”
Dengue, which can range from mild flu-like symptoms to severe illness and death, is particularly concerning due to its ability to spread undetected. Most people infected with the virus show no symptoms or only mild ones, making it easier for transmission to occur. Chikungunya, while rarely fatal, can cause painful and long-lasting joint issues.
Recent studies suggest that it now takes less than five years for newly arrived mosquito species in Europe to spark major outbreaks—down from an estimated 25 years in the 1990s. The time window for intervention is shrinking rapidly, according to Semenza.
Globally, the situation is far worse. In 2025 alone, there have already been over three million dengue cases and 220,000 chikungunya cases reported, with more than 1,400 deaths from dengue and 80 deaths from chikungunya. Yet Europe is no longer immune. In Cyprus, health authorities have reported the reemergence of the mosquito species that transmits yellow fever—raising fears of further outbreaks.
While complete eradication of mosquitoes is unlikely, experts argue that more can be done to limit their impact. Semenza has called for enhanced surveillance in warmer European countries, especially near airports and travel hubs where infected individuals could unknowingly introduce viruses. Isolating such cases quickly could prevent local transmission.
Spain has adopted an innovative approach through a “citizen science” app that allows residents to upload mosquito photos. Using artificial intelligence, the app identifies species and alerts authorities to the presence of invasive varieties such as the Asian tiger mosquito, which can spread dengue and chikungunya. Since 2023, the app has helped detect the mosquito in over 150 municipalities.
The ECDC has also urged the public to take personal precautions, including the use of insect repellent, wearing long sleeves, and avoiding outdoor exposure at dawn and dusk. Travellers returning from dengue-endemic regions are advised to continue these measures for at least three weeks to reduce the risk of local transmission.
As the mosquito season lengthens and the risk grows, experts say European nations must draw on lessons from tropical regions long accustomed to managing these threats. “In Europe, it’s still a seasonal disease,” said Semenza. “But the season is expanding—and the cases will, too.”
Health
Global Mental Health Cases Near 1.2 Billion as Anxiety and Depression Drive Sharp Worldwide Rise
A major global analysis has found that mental health conditions have surged to an estimated 1.2 billion people worldwide, driven largely by steep increases in anxiety and depression over the past three decades.
The findings, published in The Lancet as part of the Global Burden of Disease Study 2023, show that the number of people living with mental disorders has almost doubled since 1990, marking a 95% rise. Researchers say major depressive disorder and anxiety disorders have seen even sharper growth, increasing by 131% and 158% respectively, making them the most prevalent mental health conditions globally.
The report describes mental illnesses as widespread conditions that create long-term disability and significant human suffering. It also highlights broader consequences for economies and public services, including reduced productivity, lower workforce participation and increasing pressure on health and welfare systems.
Researchers estimate that in 2023 alone, around 620 million females and 552 million males were affected by mental health conditions. While the overall burden is rising across both sexes, the study points to notable differences in the types and prevalence of disorders.
Among women, depression and anxiety were the most commonly reported conditions, alongside higher rates of eating disorders such as anorexia nervosa and bulimia nervosa. The report links this disparity to a mix of biological, social and structural factors, including exposure to domestic violence, sexual abuse, gender inequality and reproductive health-related changes.
In contrast, neurodevelopmental and behavioural disorders, including attention deficit hyperactivity disorder (ADHD), conduct disorder and autism spectrum conditions, were more frequently diagnosed in men.
Teenagers aged 15 to 19 were identified as the group experiencing the highest mental health burden globally, raising concerns about early onset of conditions and insufficient preventive care for young people.
The study identifies several key risk factors associated with mental illness, including childhood sexual violence, bullying and intimate partner violence. These factors are strongly linked to conditions such as depression, schizophrenia, bipolar disorder and anxiety disorders. However, researchers note that such exposures have remained relatively stable over time and account for only a portion of the overall rise.
According to the authors, broader drivers are likely contributing to the increasing prevalence of mental disorders. These include genetic and biological influences, poverty, inequality, and the growing impact of global crises such as armed conflict, pandemics, natural disasters and climate-related stress.
While mental health conditions have long been a leading cause of disability worldwide, the report warns that the situation is worsening. At the same time, health systems have not expanded services at a pace matching demand.
The authors caution that the gap between rising need and limited access to care is becoming more pronounced, leaving millions without adequate treatment or support.
Health
Europe Records Sharp Rise in Sexually Transmitted Infections, ECDC Warns
Health
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