title: "5 Things Europeans Get Wrong About Mosquitoes: Myths vs Science" date: "2026-04-03" excerpt: "From 'mosquitoes don't carry diseases in Europe' to 'garlic repels mosquitoes,' we debunk the 5 most common European mosquito myths with scientific evidence." category: "community" author: "Mosticare Editorial"

5 Things Europeans Get Wrong About Mosquitoes

Europeans have a complicated relationship with mosquitoes. For generations, the continent's temperate climate meant that mosquitoes were summer nuisances, not health threats. That historical comfort has bred a set of assumptions that are increasingly at odds with reality. As invasive species establish themselves across the continent and locally transmitted tropical diseases appear in European cities, clinging to outdated beliefs is not just incorrect. It is risky.

Here are five persistent misconceptions that Europeans hold about mosquitoes, and the scientific reality behind each one.

Myth 1: "Mosquitoes Don't Carry Diseases in Europe"

This is the most dangerous misconception on the list, and until recently, it was largely true. For most of the 20th century, mosquito-borne diseases in Europe were limited to occasional West Nile virus cases and malaria remnants in a few southern regions. Europeans who contracted dengue or chikungunya almost always acquired it abroad.

That changed dramatically. In 2024, Europe recorded 304 locally acquired dengue cases, the highest number in recorded history. Italy alone reported 194 cases. France documented 85 autochthonous cases, surpassing its previous peak. Spain recorded locally transmitted dengue in Catalonia.

The ECDC confirmed that 2025 set new records for mosquito-borne diseases in Europe. France experienced its first locally acquired chikungunya case in Strasbourg, a city in northeastern France far from the Mediterranean coast. West Nile virus cases have been increasing steadily across Southern and Southeastern Europe for years.

The reality: Mosquito-borne diseases are now a European public health concern. The Asian tiger mosquito (Aedes albopictus), capable of transmitting dengue, chikungunya, and Zika, is established in 369 regions across 16 EU/EEA countries. Climate models project continued expansion into Western and Northern Europe. Treating mosquitoes as harmless is no longer scientifically justified.

Myth 2: "Mosquitoes Prefer People With Sweet Blood"

This is perhaps the most widespread mosquito myth globally, and Europe is no exception. The notion that mosquitoes target people with "sweet" or particular blood types has been repeated across generations. While there is a kernel of truth buried in the folklore, the popular understanding is fundamentally wrong.

Mosquitoes do not taste or sense the sweetness of blood. They locate hosts primarily through carbon dioxide exhaled during breathing, body heat signatures, specific compounds in human sweat (particularly lactic acid, uric acid, and ammonia), and to a lesser extent, skin microbiome composition.

Research has found some correlation between blood type and mosquito landing rates, with some studies suggesting Type O blood may attract slightly more bites. However, the effect size is modest compared to the dominant attractants listed above. A person with Type O blood who produces less carbon dioxide and sweat will attract fewer mosquitoes than a Type A individual who is exercising heavily.

The reality: Mosquitoes are attracted primarily by CO2, body heat, and sweat compounds. Genetics play a role in how much of these attractants you produce, which is why some people genuinely do get bitten more than others. But the explanation is biochemistry, not blood sweetness. The practical implication is that showering after exercise, wearing breathable clothing, and using repellents that mask these chemical signals are far more effective than worrying about your blood type.

Myth 3: "Citronella Candles and Garlic Keep Mosquitoes Away"

Walk through any European garden center in June and you will find shelves of citronella candles, garlic sprays, ultrasonic devices, and wristbands marketed as mosquito repellents. Their popularity is enormous. Their effectiveness, according to scientific evidence, is minimal.

Citronella oil does have mild repellent properties, but it evaporates quickly and the concentrations delivered by a candle in an outdoor setting are far below what is needed for meaningful protection. Multiple controlled studies have found that citronella candles reduce mosquito landing rates by a statistically insignificant amount compared to unscented candles. The small effect observed is likely attributable to the smoke and heat rather than the citronella itself.

Garlic consumption has no demonstrated repellent effect. While garlic compounds are detectable in sweat, they do not deter mosquitoes at the concentrations produced by eating garlic. The myth persists partly because of garlic's cultural association with repelling unwanted things.

Ultrasonic devices, which claim to repel mosquitoes with high-frequency sound, have been debunked repeatedly in peer-reviewed research. No scientific study has demonstrated any repellent effect from ultrasonic frequencies.

The reality: The only repellent active ingredients with robust scientific support for efficacy against mosquitoes are DEET (diethyltoluamide), picaridin (also known as icaridin), IR3535, and oil of lemon eucalyptus (PMD). These compounds have been tested in hundreds of studies and are recommended by the WHO and national health authorities. If you are spending money on mosquito protection, spend it on products that work.

Myth 4: "Mosquitoes Only Bite at Night"

Many Europeans schedule their mosquito precautions around dusk, assuming that mosquitoes are exclusively nocturnal creatures. This was a reasonable assumption when Europe's mosquito population consisted primarily of Culex pipiens, the common house mosquito, which does indeed prefer to bite during evening and nighttime hours.

The arrival of Aedes albopictus has shattered this pattern. The Asian tiger mosquito is an aggressive daytime biter. Its peak activity periods are during the morning hours after sunrise and in the late afternoon before sunset, precisely when people are outdoors enjoying their gardens, parks, and terraces.

This behavioral difference has significant practical consequences. A family applying repellent only for an evening barbecue but spending the afternoon unprotected in the garden is exposed during the tiger mosquito's most active hours. Parents who protect children at bedtime but not during outdoor afternoon play are addressing the wrong risk window.

The reality: Europe now hosts mosquito species that bite aggressively during daylight hours. Protection needs to be continuous during outdoor exposure throughout the day, not just at dusk. Understanding which species are active in your area, the ECDC mosquito maps are an excellent resource, helps you time your precautions correctly.

Myth 5: "A Cold Winter Kills All the Mosquitoes"

Every autumn, Europeans console themselves with the thought that winter will reset the mosquito problem. While cold temperatures do suppress adult mosquito activity, the assumption that winter eliminates mosquitoes is fundamentally incorrect.

Aedes albopictus has specifically adapted to survive European winters. Female tiger mosquitoes lay desiccation-resistant eggs in late autumn that can survive cold, dry conditions for months. These eggs enter diapause, a form of dormancy, and hatch when spring temperatures rise and water becomes available. A single productive female in autumn can seed an entire neighborhood's mosquito population the following spring.

Culex species overwinter as adults, sheltering in protected spaces such as basements, garages, and utility tunnels. They emerge when temperatures rise, immediately ready to feed and reproduce.

Climate research shows that warming winter temperatures across Europe are reducing the duration and severity of the cold season that historically limited mosquito survival. Shorter, milder winters mean more eggs survive to spring, mosquito seasons start earlier and end later, species that previously could not survive European winters find new regions habitable, and the net annual mosquito exposure period is increasing decade over decade.

The reality: European winters suppress but do not eliminate mosquito populations. The eggs that survive winter are the foundation of next year's problem. Late-season actions, such as thoroughly emptying and storing all water-holding containers in autumn, can reduce the overwintering egg population and meaningfully lower mosquito numbers the following spring.

Why Getting It Right Matters

These are not academic distinctions. Each of these myths, when believed and acted upon, leads to inadequate protection. The person who thinks European mosquitoes are harmless does not use repellent. The person who relies on citronella candles has a false sense of security. The person who only protects at dusk is unguarded when tiger mosquitoes are most active.

At Mosticare, we build our products and education around what the science actually shows, not what tradition suggests. Our mission is to close the gap between how Europeans perceive mosquito risk and what the data demonstrates. Because in a Europe where mosquito-borne disease is an emerging reality, accurate information is the first line of defense.