Do Wolbachia Mosquitoes Bite? What to Expect If Your Estate Is a Release Site (2026 Area List)

If you live in Toa Payoh, Bukit Panjang, Pioneer or Little India, you may have noticed more mosquitoes around the block this year and wondered whether they are the "government ones". If you are in Ang Mo Kio, your turn comes in October. And if you are in Tampines or Yishun, you have been living with them for the better part of a decade.

Project Wolbachia is NEA's programme of releasing male Aedes aegypti mosquitoes that carry a bacterium called Wolbachia. When they mate with the wild females in your estate, the eggs do not hatch. Release enough males for long enough and the local Aedes aegypti population, the main dengue carrier in Singapore, drops sharply.

We install window and door mesh, so mosquitoes come up on every site visit. This article is not really about mesh, though. It answers the questions people actually ask us: do the released mosquitoes bite, why am I still getting bitten if my estate is covered, and which areas are on the list. Everything is pulled from NEA and MSE releases, linked so you can check.

The short answer: no, the released mosquitoes do not bite

Only female mosquitoes bite. They need blood to produce eggs. Males of every mosquito species feed on plant nectar, and NEA's mosquito species page puts it plainly: males "including the Wolbachia-Aedes mosquitoes released under Project Wolbachia, feed on plant nectar and do not bite humans."

The obvious follow-up is whether any females slip through by accident. In a written reply to Parliament in February 2026, MSE said the sex-sorting process runs at 99.9% accuracy, that "the small number of female Wolbachia mosquitoes inadvertently released is negligible compared to the overall mosquito population", and that NEA has "not received any report of biting by male Wolbachia mosquitoes."

So if you are being bitten in a release area, the released males are not the ones doing it. We come back to who is in a moment.

Which areas are covered: the full list

NEA has expanded the project in stages since the first releases in 2016. Putting the announcements together, here is the list as of 2026.

One thing to know about the list: "covered" means selected HDB blocks and precincts within a town, not every street in it, so two neighbours in the same estate can have different experiences.

The 2026 rollout in detail

The March 2026 announcement is the big one. NEA said the five new areas would add about 100,000 households and take coverage past 800,000, or 50% of all households in Singapore, by the end of 2026, the project's 10th year.

The project page lists the schedule:

• Bukit Panjang: releases from 20 April 2026, Mondays and Thursdays
• Pioneer: releases from 20 April 2026, Mondays and Thursdays
• Little India: releases from 21 April 2026, Tuesdays and Fridays
• Toa Payoh: from July 2026, schedule to be confirmed at time of writing
• Ang Mo Kio: from October 2026, schedule to be confirmed

If you are in one of these estates, expect the numbers to look worse before they look better. NEA is upfront about this: residents "will see a temporary increase in mosquitoes with the release of the male non-biting Wolbachia-carrying Aedes aegypti." That is by design. The whole method depends on flooding the area with males so the wild females are far more likely to mate with a Wolbachia male than a wild one.

What the results say

The reason NEA keeps scaling this up is that the numbers from the earlier sites are strong.

• In release areas, the Aedes aegypti population fell by 80 to 90%.
• Residents at release sites had more than 70% lower dengue risk, from a multi-site field study covering 2022 to 2024 and published in the New England Journal of Medicine in February 2026.
• People living in adjacent areas, next to but not inside a release site, were 45% less likely to get dengue.

All three figures come from the March 2026 NEA release, and the two dengue-risk figures were repeated in NEA's peak dengue season advisory in May 2026.

For context, 2026 has been a fairly quiet dengue year so far: NEA's dengue cases page shows under 2,000 cases in the first seven months, against 13,651 for the whole of 2024. Wolbachia is not the only reason (a big year is usually followed by quieter ones), but NEA lists it among the factors.

So why are people in release areas still getting bitten?

This question fills Reddit and HardwareZone threads every year. In April 2026, MustShareNews picked up a Reddit thread from a family where one person had more than 20 bites and an elderly relative was bitten on the eyelid, with commenters from various parts of Singapore chiming in with similar stories.

There are three honest reasons this keeps happening.

1. Wolbachia only targets one species

Singapore has over 180 mosquito species. Project Wolbachia suppresses only Aedes aegypti. NEA's own page on this is titled Project Wolbachia only targets Aedes aegypti, and it names the others that still bite:

• Aedes albopictus, the other black-and-white striped one. It can also carry dengue (less efficiently), bites in the day, and breeds in the same containers plus tree holes and leaf litter near greenery. If your block faces a park or a landscaped garden, this is a likely suspect.
• Culex quinquefasciatus, the golden-brown one that bites at night and breeds in blocked drains. This is the one that whines near your ear at 2 am.

2. Suppression is 80 to 90%, not 100%

Even for Aedes aegypti, some remain, and a single neglected flowerpot plate in a corridor can produce a fresh batch regardless of the estate-wide numbers.

3. Breeding inside homes undoes the effect

This is the part NEA is most worried about. In its March 2026 announcement, NEA warned that "reduced community vigilance which leads to more mosquito breeding will negate the positive impact of Project Wolbachia." At dengue clusters in 2025, about 65% of the breeding NEA found was inside homes, not in drains or construction sites. Wolbachia males can only mate with females that come out to find them; a female that hatches in your bathroom floor trap and bites you in the same room never meets one.

What NEA still wants you to do

NEA has been consistent that Wolbachia is "designed to complement, not replace, proven source reduction efforts." In practical terms that means two routines.

B-L-O-C-K (stop breeding): Break up hardened soil, Lift and empty flowerpot plates, Overturn pails and wipe the rims, Change water in vases, Keep roof gutters clear and add BTI insecticide.

S-A-W (avoid bites): Spray insecticide in dark corners, Apply repellent, Wear long sleeves and pants.

The Block Dengue tips from Clean and Green Singapore also list "installing mosquito screens on windows/doors to keep mosquitoes out of your home" and "sleeping under a mosquito net (especially during the day since Aedes aegypti mosquitoes are day-biting)".

Where window mesh fits in (and where it does not)

Mesh on windows and doors solves one specific problem: mosquitoes flying in from outside while your windows are open. In a Wolbachia release area that population is already much smaller, but the ones that remain, plus every Culex from the drain downstairs and every Aedes albopictus from the garden, still come in through an open window. A properly fitted screen stops them without you having to remember anything, day and night. Our piece on whether mosquitoes can get through window mesh covers the weave sizes, and our insect mesh guide for Singapore windows covers the types and prices.

What mesh does not do: it will not touch a mosquito that hatched in your own flat, and it does not help at the lift lobby, the void deck or your neighbour's flowerpots. If you install screens and keep getting bitten, check your floor traps, plant saucers and aircon trays before you blame the mesh.

If you would like a quote, WhatsApp us a few photos of your windows and we can give you a rough idea. A site visit is free and there is no obligation. If you have a cat as well, our cat mesh in Singapore guide explains why the same screen has to be much stronger.

Frequently asked questions

Do Wolbachia mosquitoes bite?

No. Project Wolbachia releases only male Aedes aegypti, and male mosquitoes of every species feed on nectar and cannot bite. NEA says sex-sorting is 99.9% accurate and it has received no reports of bites from released males. If you are bitten in a release area, it is a wild female, most likely Culex at night or Aedes albopictus in the day.

Which areas in Singapore have Wolbachia mosquitoes?

Bukit Batok, Choa Chu Kang, Tampines, Yishun, Bedok North, Bedok Reservoir, Yew Tee, Geylang, Hougang, Punggol, Sengkang, Woodlands, Bukit Merah and Telok Blangah, Clementi and West Coast, Commonwealth, Holland, Marine Parade and Mountbatten, Serangoon, Jurong East and Jurong West, plus the 2026 additions: Bukit Panjang, Pioneer, Little India, Toa Payoh and Ang Mo Kio. Coverage is by selected blocks, not whole towns.

Why are there more mosquitoes in my estate after Wolbachia releases started?

That is expected in the first phase. NEA releases large numbers of males so wild females mate with them instead of wild males, so you will see more mosquitoes flying around, especially on release days. They do not bite. Over the following months the Aedes aegypti population falls, by 80 to 90% at established sites.

Does Wolbachia mean I no longer need mosquito screens or repellent?

No. NEA says the project complements source reduction rather than replacing it, and it does nothing to Culex or Aedes albopictus. Keep clearing stagnant water, use repellent when outdoors during a cluster, and if you like your windows open, a screen on windows and doors is still the simplest way to keep whatever remains outside.

Sources

MeshMates product specifications are from our own product pages.

1. NEA — Understanding Singapore's Mosquito Landscape: Why Different Species Matter (Annex B). nea.gov.sg
2. MSE — Written Reply to Parliamentary Question on Project Wolbachia (3 Feb 2026). mse.gov.sg
3. NEA — NEA's Project Wolbachia-Singapore To Be Expanded To Eight Additional Sites (15 Jun 2022). nea.gov.sg
4. NEA — Project Wolbachia-Singapore To Be Expanded To Five Additional Sites (21 Nov 2023). nea.gov.sg
5. NEA — Project Wolbachia-Singapore To Be Expanded To Five Additional Sites (3 Oct 2024). nea.gov.sg
6. NEA — Project Wolbachia Reaches Half of Singapore Households with Expansion to Five New Areas (13 Mar 2026). nea.gov.sg
7. NEA — Wolbachia-Aedes Mosquito Suppression Strategy (project page with 2026 release schedule). nea.gov.sg
8. NEA — Singapore Enters Peak Dengue Season, Public Urged to Stay Vigilant (16 May 2026). nea.gov.sg
9. NEA — Dengue Cases (weekly figures). nea.gov.sg
10. MustShareNews — S'pore netizen claims family member bitten over 20 times by mosquitoes, netizens share similar experiences (8 Apr 2026). mustsharenews.com
11. NEA — Project Wolbachia Only Targets Aedes aegypti. nea.gov.sg
12. Clean and Green Singapore — Tips and FAQs (Block Dengue). cgs.gov.sg