Is an Asian hornet sting dangerous?
Barring an allergy, an Asian hornet sting is no more dangerous than a wasp sting. The risk comes from allergic reaction, which a single sting can trigger, and from multiple stings. Difficulty breathing, facial swelling or faintness call for emergency services immediately.
What is the real risk of a single sting?
It is low for someone who is not allergic. The sting hurts and produces local redness and swelling that settle within hours to days. Asian hornet venom is no more toxic than wasp venom.
Two points are worth knowing: the hornet does not lose its sting and can therefore sting repeatedly, and the colony attacks as a group when it feels threatened, which turns a single incident into multiple stings.
Which signs call for emergency services?
Some symptoms signal a generalised allergic reaction that can escalate within minutes. They warrant an immediate call to emergency services, without waiting to see whether it passes.
- Difficulty breathing, wheezing, a sense of the throat closing.
- Swelling of the face, lips, tongue or neck.
- Hives spreading beyond the sting site.
- Dizziness, pallor, faintness, a change in the voice.
- A sting inside the mouth or throat, whatever the person's condition.
Around 4 to 5 % of people are allergic to hymenoptera venom without knowing it. Tolerating one sting guarantees nothing about the next.
What should you do in the minutes that follow?
The useful steps are simple, and they do not replace watching for the signs above for at least an hour.
- Move away from the area, other hornets may follow.
- Clean the sting with soap and water, then disinfect it.
- Apply cold for about fifteen minutes to limit swelling.
- Remove rings and bracelets if the sting is on a hand or arm.
- Watch for general symptoms and seek advice if in doubt.
How many stings before seeking care?
Numbers matter, because venom doses add up. In a child, four to five stings already justify prompt medical advice. In an adult with no known allergy, the toxic risk threshold sits higher, around twenty.
Anyone carrying an adrenaline pen should use it at the first general symptoms, then call emergency services, in that order.
Frequently asked questions
Does the Asian hornet attack without provocation?
No. Away from the nest it ignores people and does not defend its foraging area. Attacks happen when the colony senses a threat to the nest, including plain vibration nearby.
How close does the colony defend?
Defensive behaviour usually triggers within a few metres of the nest and can continue over several dozen metres. That is why the recommended safety perimeter is at least five metres.
Does a sting always need a doctor?
No, an isolated sting with no general symptoms can be treated at home. Seek care for multiple stings, a sting to the face or mouth, a known allergy, or a local reaction that keeps spreading beyond 48 hours.