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Aedes aegypti

Aedes aegypti

Its eggs survive drying for months on the side of a container. That is why it travels so well.

A mosquito that breeds in small artificial water containers and lives closely with people. Largely tropical and subtropical, restricted by cold — and confirmed breeding in Britain for the first time on 3 September 2026, without being established there.

What makes this species ecologically distinctive is not that it bites people but where it breeds. It uses small containers of standing water — the kind that collect in discarded tyres, plant pot saucers, water butts, blocked gutters and buckets — rather than ponds or marshes. That preference ties it closely to human settlement, and it is also why it travels so well: the eggs are laid on the sides of containers just above the waterline, survive drying for months, and hatch when the container refills. A shipment of used tyres can carry a viable population across an ocean without anyone noticing anything alive on board. Its distribution is largely tropical and subtropical, and cold is the main constraint. That constraint operates on several stages at once: adult survival falls sharply outside a limited temperature range, development slows and then stops as it cools, and — unlike the Asian tiger mosquito, with which it is constantly confused — it does not have the same capacity to overwinter as diapausing eggs in cool climates. Surviving a temperate summer is well within its range. Surviving a temperate winter is the harder problem, and it is the one that decides whether an introduction becomes an establishment. On 3 September 2026 the UK Health Security Agency confirmed the first detection of Aedes aegypti breeding in Britain, at residential properties in east London, with adults and larvae found. The assessment attached to that detection was specific and worth reproducing accurately: the species was not established in Britain, the detection was believed to result from accidental importation, no local disease transmission was attributed to it, and the public-health risk was described as very low. Enhanced surveillance and control followed. Every part of that is a statement about a date. What happened afterwards is not something this page can tell you, and a reader arriving later should treat the status as historical rather than current.

Early coverage · 45% complete · reviewed 2026-09-04

What this page covers

One species, and frequently confused with Aedes albopictus, the Asian tiger mosquito. Both are striped; they differ in pattern, in distribution and — importantly for temperate countries — in cold tolerance.

Often confused with: The Asian tiger mosquito, a different species with different limits; Any striped mosquito, several of which are native and unremarkable

Quick facts

Breeds in containers
Small artificial water bodies, not ponds — which ties it to people
Eggs survive drying
Laid above the waterline; hatch months later when refilled
UK status, 3 September 2026
Breeding confirmed · not established · risk assessed very low
Not the tiger mosquito
A different species, with substantially greater cold tolerance

Why this species travels so well

Eggs that survive months of drought, in a container going somewhere.

Females lay eggs singly on the inner walls of water-holding containers, just above the surface. The eggs tolerate drying for months. When rain or a tap refills the container the eggs hatch, and a population appears in a place that had held nothing alive. That biology makes the species unusually portable: what is being transported is not a mosquito but a dry container with eggs stuck to the inside.

It also explains why the used tyre trade features so heavily in the history of mosquito introductions. A stack of tyres holds water in every casing, ships in bulk between continents, and dries and refills repeatedly on the way. Ornamental plants shipped in water do something similar, and so, occasionally, does an aircraft.

What stops it, and what does not

Surviving a summer and surviving a winter are different problems.

Aedes aegypti and the Asian tiger mosquito are different species with different limits. The tiger mosquito tolerates cool temperate conditions and has established widely in Europe; aegypti is far more restricted by cold.

Established

Specialists would state this without hedging. Multiple independent lines of evidence agree.

Aedes aegypti and Aedes albopictus differ in distribution and in thermal tolerance. Aedes albopictus persists in temperate regions, overwintering as diapausing eggs in cooler climates, and has established across much of southern and central Europe. Aedes aegypti has a substantially more restricted, largely tropical and subtropical distribution.

Who this applies to
Global distributions and thermal limits of the two species.
Studied in
Aedes aegypti, Aedes albopictus
Why we rate it this way, and what the caveats are
EstablishedHigh confidence

Distributions are well documented and the difference in cold tolerance is consistent across sources.

How far it can be extended

Established by compiled global occurrence records and by survival modelling for both species.

Caveats

  • Both distributions have continued to change since the sources were published.
  • Overwintering strategy differs as well as adult tolerance, and it is often the deciding factor for establishment.

Still unanswered

  • How far Aedes aegypti’s effective cold limit can shift through local adaptation, which is not well constrained.

Last reviewed 2026-09-04

The evidence (2 studies)

Adult survival drops sharply outside a limited temperature range, and development from egg to adult slows and then stops as conditions cool. None of that prevents a population appearing during a warm temperate summer. The question that decides establishment is what happens in January, and here the difference from the Asian tiger mosquito matters: that species overwinters as diapausing eggs in cool climates, and Aedes aegypti does not have the same capacity.

Urban microclimates complicate this in the species’ favour. Cities are warmer than the surrounding countryside, and heated buildings, drains and sheltered containers can offer conditions the regional climate does not. That is a reason for surveillance rather than for alarm, and it is why detections cluster around ports and dense urban areas.

The British detection, and exactly what it was

A status on a date, reported as one.

On 3 September 2026 UK authorities confirmed Aedes aegypti breeding in Britain for the first time, in east London. As of that date it was not established, and the assessed public-health risk was very low.

Established

Specialists would state this without hedging. Multiple independent lines of evidence agree.

UK Health Security Agency surveillance confirmed adult Aedes aegypti and larvae at residential properties in east London, constituting the first confirmed breeding of the species in Britain, reported 3 September 2026. The detection was attributed to accidental importation. As of that date the species was not established in Britain, no local disease transmission was attributed to the population, and the assessed public-health risk was described as very low. Enhanced surveillance and control were implemented.

Who this applies to
A dated status for one detection in Britain. It describes 3 September 2026 and no later date.Do not extend this beyond the taxa listed — the popular version over-reaches.
Studied in
Aedes aegypti
Why we rate it this way, and what the caveats are
EstablishedHigh confidence

An official surveillance determination by the responsible national body. The confidence attaches to the status as reported on that date, not to any later state.

How far it can be extended

A single detection event with a specific official assessment attached to a specific date. It says nothing about other species, other places, or any subsequent situation.

Caveats

  • Time-sensitive. This is a status on a date, and the situation may have changed since in either direction.
  • Breeding confirmed is not establishment: establishment requires a population persisting across seasons, including through winter.
  • Location is given at the granularity the official source used. No property-level detail is reproduced here.

Still unanswered

  • Whether this population persisted, was eliminated, or recurred — which only later surveillance can answer.

Last reviewed 2026-09-04

The evidence (2 studies)
UK status as reported on 3 September 2026
StateStatusBasis
DetectedYesAdults and larvae found by surveillance, east London
Breeding detectedYesLarvae present — first confirmed breeding in Britain
EstablishedNoNo population shown to persist across seasons
Locally transmittingNoNo local transmission attributed to this population
Assessed public-health riskVery lowOfficial assessment accompanying the detection
Likely pathwayAccidental importationOfficial assessment

The table is dated because the situation is. A status like this can change in either direction — a population can be eliminated by control, or it can persist and be found again the following year — and only later surveillance can say which happened. Anybody reading this after 2026 should treat every row as a historical record rather than a current one.

Related

The research behind this page

4 studies, newest first. Each one has a page explaining what it found and what it could not show.

2026UK Health Security Agency

Aedes aegypti breeding detected in England: surveillance statement

Aedes aegypti was confirmed breeding in Britain for the first time, at residential properties in east London.

2015eLife

The global distribution of the arbovirus vectors Aedes aegypti and Ae. albopictus

The two species have distinct global distributions and distinct predicted suitability.

2013Parasites & Vectors

Modelling adult Aedes aegypti and Aedes albopictus survival at different temperatures in laboratory and field settings

Adult survival for both species declines sharply outside a limited temperature range, with the temperature response differing between the species and field survival generally lower than laboratory survival at equivalent temperatures.

2012Vector-Borne and Zoonotic Diseases

A review of the invasive mosquitoes in Europe: ecology, public health risks, and control options

Introductions have occurred repeatedly via international trade — notably the used tyre and ornamental plant trades — and shipping and road transport.

This page is a stop on a longer route

A guided journey reads several subjects in a deliberate order, with an argument for why one follows another. You can join in the middle.

Where to go from here

Each of these follows from something on this page — a relationship in the evidence, a claim people ask about, or the next mechanism along.

How complete this page is, and what it is still missing

NatureHQ publishes its own gaps. This page is at 45% completeness against what we would call a finished subject, and was last reviewed on 2026-09-04. It carries 3 claims and answers 3 mapped search questions.

  • more experiments could be explained in plain English
  • no popular claim about this subject has been checked yet
  • Vector biology and pathogen transmission are described only in outline; this site is not a public-health resource.
  • The Asian tiger mosquito deserves its own page and does not yet have one.
  • Identification guidance is deliberately omitted: reliable identification needs a specimen and a specialist.