Health
Tiger mosquitoes blamed for spread of dengue fever: ‘Most invasive species’
As dengue fever continues to spread throughout Europe, experts are blaming an invasive mosquito species as the culprit.
Known as “tiger mosquitoes,” the insects — of the species name Aedes albopictus — have spread into 13 EU countries, according to an alert from the European Centre for Disease Prevention and Control (ECDC).
Elitza Theel, PhD, director of Mayo Clinic Laboratories in Minnesota, confirmed that tiger mosquitoes are a “known vector” for dengue virus and can transmit the virus to individuals who have not previously been infected.
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“This mosquito species is concerning for a number of reasons, including that it is considered the most invasive species in the world,” she told Fox News Digital.
“Although typically considered a tropical mosquito, it is able to survive in cooler climates.”
Tiger mosquitoes — the species Aedes albopictus — have spread into 13 EU countries, according to an alert from the European Centre for Disease Prevention and Control. (iStock)
The mosquito species is moving further and further north globally as temperatures grow warmer, the expert said.
“Tiger mosquitoes are also rather aggressive, biting both humans and animals at any time of the day, rather than just at dawn or dusk, which is typical of other mosquito species,” Theel warned.
Health officials claimed that climate change is one of the factors contributing to the spread of these insects.
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“Europe is already seeing how climate change is creating more favorable conditions for invasive mosquitoes to spread into previously unaffected areas and infect more people with diseases such as dengue,” said Andrea Ammon, ECDC director, in a press release from the agency.
“Increased international travel from dengue-endemic countries will also increase the risk of imported cases, and inevitably also the risk of local outbreaks,” she continued.
“This mosquito species is concerning for a number of reasons.”
“Personal protective measures combined with vector control measures, early detection of cases, timely surveillance, further research and awareness-raising activities are paramount in those areas in Europe most at risk.”
What is dengue fever?
Dengue fever is a virus spread through bites from an infected mosquito.
It is common in the Americas, Africa, the Middle East, Asia and the Pacific Islands, among other countries, according to the U.S. Centers for Disease Control and Prevention (CDC).
Each year, up to 400 million people are infected, the CDC said.
There is a vaccine available for U.S. children between 9 and 16 years of age who have previously tested positive for dengue and are living in areas where the infection is common. (iStock)
Typical symptoms include aches and pains (in the eyes, muscles, joints or bones), nausea, vomiting and rash, usually experienced within two weeks of being bitten.
Most people experience symptoms for two to seven days before recovering.
“It’s typically a more mild illness, but can be severe, causing headaches, joint pain, fever, abdominal pain and even death,” Dr. Mark Fischer, regional medical director of International SOS, a leading medical and security services company, told Fox News Digital.
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“One of the reasons for the higher rate of infection is due to the fact that the tiger mosquito, the carrier of dengue, has adapted to living in urban environments and alongside humans,” said Pennsylvania-based Fischer.
There is not currently a medication to treat dengue, the CDC noted.
“This species … has established populations in several [U.S.] states.”
Infected people are advised to rest, take acetaminophen for pain and fever, stay hydrated and see a doctor.
There is a vaccine available for U.S. children between 9 and 16 years of age who have previously tested positive for dengue and are living in areas where the infection is common.
Dengue fever in the US
While dengue fever is most prevalent in the tropics and subtropics, experts warn that it’s also rising globally.
“Based on information from the National Invasive Species Information Center, this species of mosquito was first identified in the United States in 1985 and has established populations in several states,” Fischer told Fox News Digital.
Typical symptoms include aches and pains (in the eyes, muscles, joints or bones), nausea, vomiting and rash, usually experienced within two weeks of being bitten by an infected mosquito. (iStock)
There does not currently seem to be an immediate threat of tiger mosquitoes to the U.S., however, noted Fischer.
“That said, with climate change affecting the globe and tiger mosquitoes thriving in warm temperatures and in urban cities, it is possible that they can become an increasing danger in the coming months and years,” he said.
In 2024, there were 1,984 dengue cases in the U.S., according to CDC data.
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Most of those were reported by people who had been infected outside the country before returning.
“Although this species of mosquito is currently found in the U.S., at present it is considered a nuisance mosquito, because the viruses it is competent to transmit are not circulating or endemic in the United States,” Theel said.
Other risks of mosquitoes
Mosquitoes are considered the world’s deadliest animal because they transmit so many dangerous pathogens, with dengue being the most common — “over 390 million infections annually worldwide,” Theel noted.
While dengue is one of the “most concerning viral pathogens” that mosquitoes transmit, Theel warned that they also transmit malaria, which causes over 240 million infections each year and remains a serious problem in Africa and regions of southeast Asia.
Mosquitoes are considered the world’s deadliest animal because they transmit so many dangerous pathogens. Dengue is the most common — “over 390 million infections annually worldwide,” one expert noted. (iStock)
“These mosquitoes can also transmit other viruses, like Chikungunya virus and Zika virus, to humans — and dirofilaria, a parasitic nematode, to both dogs and humans,” she said.
“The West Nile Virus, St. Louis Encephalitis virus and Eastern Equine Encephalitis virus are some of the mosquito-borne viruses that we are concerned with annually in the U.S., all of which can lead to severe neurologic disease and sequelae,” Theel added.
“Each year, one million people die from mosquito-related illness, so these insects do pose a serious threat to global health.”
Depending on where in the world they reside, some people may be more at risk for some of these illnesses than others, said Fischer.
“It is important to check your local government resources to see which, if any, of these diseases you may be most susceptible to and make sure you are taking proper precautions to avoid mosquito-borne illness,” he advised.
“Each year, one million people die from mosquito-related illness, so these insects do pose a serious threat to global health.”
Prevention of mosquito-borne disease
In its alert, the ECDC called for “efficient but eco-friendly tools to manage mosquito populations” and recommended “removing stagnant water in gardens or balconies where mosquitoes breed.”
“It’s important to wear insect repellent that contains DEET, picaridin or lemon and eucalyptus oil, as these ingredients are the most effective at repelling mosquitoes and other insects,” Fischer advised.
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“Those who live in areas with mosquito populations should try to wear long-sleeved shirts and long pants, especially at dusk and in the evening, when mosquitoes are most active, to avoid getting bitten on exposed skin.”
Keeping screens on windows and doors is also a good way to prevent insects from entering and potentially causing the spread of disease, he said.
Individuals should always use EPA-registered insect repellent when outdoors in areas where mosquitoes and ticks are prevalent, an expert advised. (iStock)
“If you live in an area that has a high level of mosquito-borne diseases, you should use mosquito nets when sleeping and eliminate any standing water in and around the home, since still bodies of water are breeding grounds for the insects,” Fischer recommended.
“Individuals should always use EPA-registered insect repellent when outdoors in areas where mosquitoes and ticks are prevalent — particularly at dawn and dusk when mosquitoes are most active,” Theel recommended.
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“If camping or spending prolonged time outdoors and in forested areas, individuals could consider treating their clothing with permethrin to repel insects as well.”
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Parents are being warned of a new trend among kids, involving alcohol and an open flame.
The “fire-breathing” challenge has led to reports of severe burns, according to local news outlets.
Kids and teens are reportedly holding alcohol in their mouths and blowing it onto a match or another open flame to mimic “breathing fire.”
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According to Philadelphia’s 6ABC News (WPVI), a teen in Pitcairn, Pennsylvania, was intubated and treated for burns to the face, neck and chest after attempting the trend.
A “fire-breathing” challenge is leaving kids with severe burns, according to local reports. (iStock)
“Luckily, in this particular case, it did not burn the building down,” Al Hussey, Wilmerding Borough fire marshal, told WPVI.
“But somebody really got hurt, and, you know, is going to have life-altering injuries.”
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Pitcairn Fire Chief Tommy Dick told CBS News Pittsburgh (KDKA) the 14-year-old girl was playing with isopropyl alcohol at an apartment complex.
“It’s not a very smart thing for anybody to do, let alone children,” Dick said. “It’s supposed to be for cleaning off wounds and cuts and stuff, not ingesting and trying to blow fire.
A local fire chief told CBS News Pittsburgh that the incident could have been fatal for the teen. (iStock)
“This could have easily gone inside their digestive tract, and she could have died.”
Anyone who has ingested isopropyl alcohol requires immediate medical attention, according to Healthline, because it can cause stomach pain, dizziness, confusion and slowed breathing. In severe cases, it can lead to a coma.
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Fire experts are urging parents to closely monitor which household products are within their children’s reach.
Ingesting isopropyl alcohol requires immediate medical attention, according to experts. (iStock)
“If they’re doing their hair with chemicals, if they’re taking isopropyl alcohol in the room or any type of fingernail polish remover,” Hussey said. “Obviously, monitor your lighters and your matches and educate your children.”
Multiple cases of children’s injuries have occurred in recent weeks after being allegedly “inspired” by online stunts, WPVI reported. One trend involved microwaving a toy that burst and left severe burns on a 9-year-old’s face.
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Valerian, an herbal supplement long used for sleep and relaxation, has been referred to as “nature’s Valium” — but experts are divided on whether it truly compares to the prescription sedative.
The herb, which is sold as a dietary supplement in the U.S., is a common ingredient in products marketed as “mild sedatives” and sleep aids, according to the National Institutes of Health.
Valium, the brand name for diazepam, is used to treat anxiety, seizures and muscle spasms by calming the nervous system, Cleveland Clinic notes.
Valerian supplements are derived from the roots of Valeriana officinalis, a flowering plant native to Europe and Asia that has also naturalized in northeastern America, according to the American Botanical Council (ABC).
The plant has a “long history of medicinal use,” per the ABC, with the primary goal of reducing anxiety and stress as well as improving sleep quality. It has historically also been used for migraines, fatigue and stomach cramps.
Valerian has historically been used for migraines, fatigue and stomach cramps. (iStock)
Dried valerian roots can be prepared as teas or tinctures, while other plant materials and extracts have been distributed as capsules or tablets, per the NIH.
The agency noted, however, that there is a “relatively small amount of research” investigating the herb’s impact on various conditions.
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However, Stefan Gafner, Ph.D., chief science officer of the American Botanical Council in Texas, confirmed that some clinical trials have explored valerian root’s effects.
A 2020 medical review published in the Journal of Evidence-Based Integrative Medicine found that both powdered root and root extracts show a “clear” benefit in treating anxiety, Gafner told Fox News Digital.
Valerian root and other parts of the plant can be prepared as teas, extracts, capsules and tablets. (iStock)
The researchers concluded that valerian could be a “safe and effective herb to promote sleep and prevent associated disorders.”
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While valerian may have some benefits, Gafner said he doesn’t think it “makes sense” to compare it to diazepam (Valium).
“I can understand that both are used to relieve anxiety, but valerian is a much milder ingredient, and is really used for mild cases of anxiety and sleep issues,” he told Fox News Digital.
Some valerian users have reported improved sleep and reduced anxiety, according to recent research. (iStock)
Unlike valerian, diazepam carries a risk of dependence and is generally prescribed short-term, the expert said, and the spectrum of potential adverse effects is “very different.”
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Gafner said he “absolutely” recommends the use of valerian root to relieve anxiety and stress and to improve sleep.
“I have used it myself and I believe it’s an ingredient with well-documented benefits, especially for people with problems falling asleep,” he said. “It is well-tolerated and very safe… although some sources caution [against] driving a car or using heavy machinery when using valerian.”
Valeriana officinalis, a herbal plant used as a mild sedative, in bloom. (iStock)
Dr. Joseph Mercola, a board-certified family medicine osteopathic physician and author of the new book “Weight Loss Cure,” said valerian’s comparisons to Valium may “exaggerate what the science actually shows.”
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“Valerian root contains compounds that appear to enhance calming brain chemicals, particularly the neurotransmitter GABA, which helps quiet nerve activity and supports relaxation,” the Florida-based expert told Fox News Digital.
“Some studies do report modest improvements in sleep quality or shorter time to fall asleep, while others find no meaningful difference compared with placebo.”
Valerian supplementation may not be right for everyone seeking better sleep, one doctor said. (iStock)
Side effects may include headaches, dizziness, digestive upset or next-day grogginess, Mercola noted, adding that he would not recommend it as a primary strategy for anxiety, stress or sleep.
“Because long-term safety studies remain limited, and supplement quality varies widely, you should approach valerian with caution rather than view it as a universal sleep solution,” he advised.
“You should approach valerian with caution rather than view it as a universal sleep solution.”
“I encourage people to focus first on strategies that correct the underlying drivers of poor sleep,” Mercola advised. “When you fix those foundations, you often find that you no longer need an herbal sedative at all.”
“I encourage people to focus first on strategies that correct the underlying drivers of poor sleep,” one doctor advised. (iStock)
“Bright sunlight during the day helps regulate your circadian rhythm and signals your brain to produce melatonin later at night,” he said. “At the same time, complete darkness [at night] supports the hormonal signals that allow deep, restorative sleep.”
Certain nutrients can also promote relaxation and sleep quality, including magnesium, which helps to regulate the nervous system, according to the doctor.
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GABA may help to calm nerve activity, reduce stress markers and improve perceived sleep quality, Mercola said, while glycine — taken at about 3 grams an hour before bed — may support relaxation, promote the body’s nighttime temperature drop, and improve sleep onset and overall quality.
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“When you combine sunlight exposure, magnesium, GABA and glycine, you support the biological systems that control sleep instead of relying on a sedating herb with mixed evidence,” the doctor concluded.
Fox News Digital reached out to valerian root manufacturers requesting comment.
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GLP-1 medications such as Ozempic and Wegovy have transformed treatment for Type 2 diabetes and obesity, but new research suggests doctors may need to pay closer attention to bone health, especially in older patients taking the drugs.
Older adults with Type 2 diabetes who started GLP-1s had an 11% higher risk of fragility fractures compared to those taking other diabetes medications, a study published in February in the Journal of Clinical Endocrinology & Metabolism found.
Dr. Michal Kasher Meron, an endocrinologist at Meir Medical Center in Israel and lead author of the study, said the relative increase may sound small, but it carries weight for an at-risk population.
“Both older age and Type 2 diabetes are independent risk factors for fragility fractures,” Kasher Meron told Fox News Digital. “This is a population that deserves special attention.”
A new study suggests older adults with Type 2 diabetes taking GLP-1 medications may face increased fracture risk. (iStock)
Fragility fractures are breaks from minor falls or routine activity, often linked to osteoporosis, and can lead to hospitalization, loss of independence and even increased mortality in older adults, Kasher Meron noted.
The study followed more than 46,000 adults 65 and older for nearly three years. After adjustments, GLP-1 users had a modest but statistically significant increase in fracture risk.
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Previous research in younger patients using older GLP-1s did not show increased fracture risk, but newer, more potent versions are now widely prescribed to older adults, Kasher Meron noted.
“In older adults treated with contemporary medications, the fracture risk picture looks different and warrants close attention,” she said.
Separate research found slightly higher rates of osteoporosis and gout among adults using GLP-1s. (iStock)
The study, however, was observational, meaning it shows an association but not causation. Researchers were unable to determine whether the risk was driven by weight loss, changes in diet, muscle loss or a direct effect on bone.
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Nonetheless, Kasher Meron says, “Bone health should be assessed before starting these medications in older patients — not as an afterthought.”
The findings come as separate research presented at the American Academy of Orthopaedic Surgeons’ annual meeting this month raised additional bone health concerns.
In an analysis of more than 146,000 adults with obesity and Type 2 diabetes, GLP-1 users were found to have a 29% higher relative risk of osteoporosis over five years compared to nonusers, according to reports.
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Rates of gout were also slightly higher, affecting 7.4% of GLP-1 users compared to 6.6% of nonusers — about a 12% relative increase.
Experts recommend bone density screening for older adults taking GLP-1 medications. (iStock)
Osteomalacia, a softening of the bones, was rare but occurred about twice as often in GLP-1 users, according to the study, which has not yet been peer reviewed. It was also observational, showing only an association. Fox News Digital has reached out to the researcher for comment.
Several mechanisms could be at play, experts say. GLP-1 medications suppress appetite and can lead to rapid weight loss. Significant weight loss is known to reduce bone density, partly because less mechanical load is placed on the skeleton.
“It’s the same idea as when we always hear about astronauts going up into space, and they’re in a gravity-zero environment for too long,” lead author Dr. John Horneff, an associate professor of orthopedic surgery at the University of Pennsylvania, told NBC News.
“There’s nothing forcing their bones to kind of hold their weight anymore. And a lot of those astronauts come back with low bone density.”
Additionally, eating fewer calories may also mean lower intake of calcium, vitamin D and protein, nutrients critical for bone strength.
GLP-1 medications like Ozempic and Wegovy are widely used to treat Type 2 diabetes and obesity. (iStock)
Rapid weight loss can also temporarily increase uric acid levels, a byproduct of tissue breakdown, which may explain the uptick in gout cases.
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Despite the findings, experts say the results should not discourage appropriate use of GLP-1 medications, which have proven benefits for blood sugar control, weight loss and cardiovascular risk reduction.
In addition to bone density screening, experts say patients should ensure adequate nutrition and resistance training to help preserve muscle and bone during weight loss.
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A spokesperson for Novo Nordisk, which manufactures GLP-1 medications, said the company prioritizes patient safety, works closely with the U.S. Food and Drug Administration (FDA) and welcomes independent research into its products.
Experts also recommend proper nutrition and resistance training to help preserve muscle and bone health during weight loss. (iStock)
The known risks and benefits of the drugs are reflected in the current FDA-approved labeling, Liz Skrbkova, head of U.S. media relations for Novo Nordisk, told Fox News Digital. She emphasized that semaglutide has demonstrated cardiovascular, kidney and liver benefits when used under medical supervision.
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“Osteoporosis is a complex condition that develops over many years as a result of interdependent risk factors,” Skrbkova added.
Fox News Digital’s Melissa Rudy contributed reporting.
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