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Air Pollution Linked to Increased Dementia Risk, Major Study Finds

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Long-term exposure to air pollution could significantly raise the risk of developing dementia, according to a major new study published in The Lancet Planetary Health. The findings add to growing global concerns about the impact of dirty air not just on physical health, but also on the brain.

The study, led by researchers at the University of Cambridge, is the largest analysis to date examining the relationship between air pollution and cognitive decline. It assessed data from 51 previous studies, encompassing nearly 30 million people—mostly from high-income countries—and found a clear link between exposure to polluted air and an increased risk of dementia.

Pollutants such as fine particulate matter (PM2.5), nitrogen dioxide from burning fuels, and soot from traffic and wood-burning stoves were found to be particularly harmful. These pollutants appear to have a stronger association with vascular dementia, which results from reduced blood flow to the brain, although links to Alzheimer’s disease were also noted.

“Air pollution is not just an environmental issue – it’s a serious and growing threat to our brain health,” said Dr. Isolde Radford, senior policy manager at Alzheimer’s Research UK.

Dementia, which affects an estimated 57 million people worldwide, occurs when connections between nerve cells in the brain are damaged or lost. While known risk factors include age, genetics, and lifestyle, air pollution has emerged in recent years as a potential contributor.

Although the exact biological mechanisms remain unclear, scientists believe that inhaled pollutants may trigger inflammation and oxidative stress in the brain—both of which have been linked to the onset and progression of dementia.

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Professor Barbara Maher, an environmental scientist at Lancaster University who was not involved in the research, warned that the human body is largely defenceless against the ultrafine particles produced by traffic and indoor heating sources. “These microscopic pollutants are deeply harmful, especially when inhaled over long periods,” she said.

Despite the strong correlations found, the study had limitations. It relied on estimates of pollution exposure based on participants’ home addresses and did not pinpoint when in a person’s life pollution exposure might be most dangerous. Some researchers argue that more precise and long-term studies are needed.

“This article answers the question of whether air pollution is associated with dementia better than previous work,” said Dr. Tom Russ, a dementia researcher at the University of Edinburgh, “but we still need better research to clarify how and why air pollution might be bad for the brain.”

In the meantime, researchers and dementia advocacy groups are urging governments to tighten air quality regulations and invest in cleaner energy and transport systems to protect public health.

“Far more needs to be done to tackle this invisible threat,” Radford said.

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Wegovy Weight-Loss Pill Hits German Pharmacies at Up to €280

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Novo Nordisk’s Wegovy weight-loss pill has gone on sale in German pharmacies, giving adults an alternative to the weekly injection already used to treat obesity.

The prescription-only tablet became available in Germany on September 1 following approval by European regulators in July. Germany is the first European country where the oral version of Wegovy is being marketed. Novo Nordisk described the launch as a major milestone for its obesity treatment business.

The tablet contains semaglutide, the same active ingredient used in the injectable form of Wegovy. The medicine works by mimicking a gut hormone involved in regulating appetite and increasing feelings of fullness, which can help people eat less.

Novo Nordisk expects the retail pharmacy price for the adult tablet to range from about €170 to €280. Unlike the injectable version, which is approved for some children aged 12 and above, the tablet is currently authorised only for adults.

Evidence supporting the European approval came largely from the OASIS-4 clinical trial. In the study, 205 participants received the semaglutide tablet, while another 102 were given a placebo. Adults taking the medicine lost an average of about 13.6 per cent of their body weight during the 64-week treatment period.

The weight reduction was lower than that recorded with injectable semaglutide in a separate study, where participants lost an average of 19 per cent. However, the injection trial lasted 72 weeks, giving participants eight additional weeks of treatment.

The tablet also carries potential side effects. Gastrointestinal problems such as nausea and diarrhoea are among the commonly reported reactions. In some cases, semaglutide can also cause inflammation of the pancreas.

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The main difference for patients is how the medicine is taken. The tablet must be taken every day, while Wegovy injections are administered once a week.

Julia Szendrödi, president of the German Diabetes Association, said medication should be used alongside healthy eating and physical activity. She stressed that obesity treatments are designed to form part of a wider approach to managing a chronic disease rather than serving as a quick solution for weight control.

Szendrödi also called for stronger prevention measures, including clearer food labelling, improved nutritional standards for school meals and restrictions on advertising unhealthy food to children.

The launch comes as pharmaceutical companies compete for a rapidly expanding global obesity-drug market. Analysts expect the sector could generate about $100 billion in annual sales by 2030.

Novo Nordisk faces growing competition from rivals including Eli Lilly, which is expanding its own oral weight-loss treatment portfolio. In the UK, Eli Lilly’s Foundayo pill is scheduled to become available.

Wegovy and similar medicines are primarily intended for people with obesity, generally defined as a BMI of 30 or higher. They may also be prescribed to some people with a lower BMI when excess weight is linked to conditions such as type 2 diabetes or sleep apnoea.

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Congo Begins Ebola Vaccination Campaign as Deadliest Outbreak Escalates

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The Democratic Republic of Congo has begun vaccinating people against Ebola as authorities try to contain the country’s fastest-growing outbreak of the disease, while researchers continue testing a vaccine designed specifically for the strain responsible for the current crisis.

The vaccination campaign began on Thursday in Kisangani, the capital of Tshopo province. Health workers and other frontline responders are being prioritised for the Ervebo vaccine, which has previously been effective against outbreaks caused by the more common Zaire strain of Ebola.

Health Minister Roger Kamba said the first priority was to protect people working directly with Ebola patients and communities affected by the outbreak.

Government figures showed that, as of Tuesday, Congo had recorded 5,713 confirmed Ebola cases, including 2,744 deaths. The outbreak is concentrated mainly in Ituri province and has become the deadliest of the country’s 17 Ebola outbreaks.

The situation has been worsened by insecurity, population displacement, large movements of people and a strike by health workers. The World Health Organization has warned that the outbreak remains out of control and could surpass the 2014-2016 Ebola epidemic in West Africa, which killed more than 11,000 people, mainly in Guinea, Liberia and Sierra Leone.

70,000 vaccine doses approved

The WHO said 70,000 doses of Ervebo had been approved for use in Congo. More than 50,000 doses have already arrived, while another 20,000 doses are being allocated to a clinical trial examining whether the vaccine can provide protection against the Bundibugyo strain.

The current outbreak is caused by Bundibugyo virus, for which there is currently no licensed vaccine or treatment specifically approved for the strain.

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Ervebo is being administered under a compassionate-use programme, allowing a medical product to be used in serious disease situations when it has not been specifically approved for the particular strain involved.

Health authorities believe the vaccine could offer some protection because the Bundibugyo and Zaire strains are related. However, researchers have yet to establish how effectively Ervebo can prevent illness caused by the current strain.

Placide Mbala Kingebeni, Africa CDC’s director for research, clinical trials and innovation, said information gathered during the vaccination campaign would help scientists assess the vaccine’s performance.

The campaign is expected to cover 14 health zones across Tshopo, Bas-Uele and Haut-Uele provinces. Kamba has urged health workers to receive the vaccine, saying it could help protect them and reduce the risk of transmission into their communities.

New vaccines under testing

Scientists are also working on vaccines specifically targeting Bundibugyo virus. The University of Oxford’s Vaccine Group and Moderna have begun human trials of new candidates.

Both programmes are currently in Phase I, where researchers assess safety, tolerability and the immune response generated by the vaccines.

The combined vaccination and research effort is intended to provide immediate protection for those most exposed to the outbreak while generating evidence that could help deliver a targeted vaccine for future Bundibugyo outbreaks.

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89-Year-Old Man Dies From West Nile Virus in Andalusia as Cases Reach 54

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An 89-year-old man from Guadalema de los Quintero, an outlying district of Utrera in Spain’s Seville province, has died after developing meningoencephalitis caused by West Nile virus, becoming the second person to die from the infection in Andalusia this season.

The man had been receiving treatment at Virgen del Rocío Hospital in Seville since Monday. His death comes as health authorities continue to monitor an increase in West Nile virus infections across the region.

Andalusia has now recorded 54 human cases of West Nile fever this season. Of these, 37 have been classified as mild, while 17 involved severe illness. Four patients remain in hospital, while the others have recovered or are recovering.

The first death linked to the virus this season was recorded on August 5. The victim was an 82-year-old resident of Dos Hermanas who also had underlying health conditions.

Seville remains at centre of outbreak

The Andalusian regional government has placed 27 municipalities, one district and one outlying settlement under health alerts following the detection of human infections or evidence that the virus is circulating among mosquitoes, birds or horses.

Most of the affected locations are in Seville province. They include Seville city, Dos Hermanas, Coria del Río, La Puebla del Río, Los Palacios y Villafranca and Guadalema de los Quintero.

Recent surveillance has also found large numbers of female mosquitoes capable of transmitting West Nile virus in several municipalities, including La Puebla del Río, Los Palacios y Villafranca, Isla Mayor and Villamanrique de la Condesa.

Authorities are continuing mosquito monitoring and other measures to limit the spread of the infection, particularly in areas where virus activity has been detected.

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What is West Nile virus?

West Nile virus is mainly transmitted to people through bites from infected mosquitoes. Birds play an important role in maintaining the virus in nature, while mosquitoes can transmit it to humans and other animals.

The virus was first identified in Uganda in 1937 and later spread to other parts of the world. Warmer temperatures have contributed to conditions that can allow mosquitoes to remain active for longer periods, increasing opportunities for transmission.

Most people infected with West Nile virus do not develop symptoms. Those who become ill commonly experience fever, headache, muscle or joint pain, vomiting, diarrhoea or skin rashes.

In a small proportion of infections, the virus can cause serious neurological complications, including encephalitis and meningitis. Older adults and people with certain chronic health conditions face a greater risk of severe disease.

The latest death has renewed attention on the risks posed by the virus as Andalusian authorities continue monitoring affected communities and mosquito populations.

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