Heres Why Singapore Is Releasing Millions Of Mosquitoes As A Way To Control Population

If you’re in Singapore and it feels like mosquitoes are suddenly everywhere, you’re not imagining it. In fact, the country has been deliberately releasing more mosquitoes each week. Counterintuitive as it sounds, this isn’t a misstep – it’s a carefully designed public health strategy. As reported by Channel News Asia, the move is rooted in science, aiming to curb the overall mosquito population rather than worsen it. Here’s how it works.

As per the report, Singapore’s strategy of releasing millions of mosquitoes each week is actually aimed at reducing the mosquito population. Before you reach for the fly swatter, there’s an important detail: these mosquitoes don’t bite. The insects being released are male Aedes mosquitoes, and only female mosquitoes feed on blood and bite humans.

What makes these males special is that they carry a naturally occurring bacterium called Wolbachia. When Wolbachia-infected male mosquitoes mate with wild female Aedes mosquitoes, the resulting eggs fail to hatch. Over time, this disrupts the breeding cycle, causing mosquito numbers to decline and helping curb the spread of mosquito-borne diseases such as dengue.

The initiative is backed by Google, and researchers consider Wolbachia-based mosquito control to be one of the most promising tools for combating mosquito-borne diseases. Wolbachia is a naturally occurring bacterium found in many insect species, including butterflies, bees, and beetles. Importantly, it poses no risk to humans or animals, but it has a remarkable effect when introduced into mosquitoes.

The Aedes aegypti mosquito – the primary carrier of diseases such as dengue, Zika, and chikungunya – does not naturally harbour Wolbachia. However, scientists can introduce the bacterium into these mosquitoes under controlled conditions. Once present, Wolbachia interferes with the ability of viruses to multiply inside the mosquito's body. As a result, infected mosquitoes are far less likely to transmit these diseases to humans. Studies suggest that this approach can significantly reduce the spread of mosquito-borne illnesses.

The process begins with a high-speed screening system inside a specialised facility, where every mosquito undergoes automated sorting before release. Millions of mosquitoes are processed each day through an AI-powered sex-sorting machine, with each insect travelling through individual lanes. As they pass through, high-resolution images are captured and analysed in real time to distinguish males from females. Artificial intelligence then identifies the non-biting male mosquitoes, which are the only ones selected for release.

These mosquitoes are then released into the wild, where they mate with female Aedes mosquitoes. Because the released males carry Wolbachia, the eggs produced from these pairings fail to hatch, preventing the next generation from developing. Over time, this gradually suppresses the mosquito population and helps reduce the spread of mosquito-borne diseases.

The results have been striking. According to Channel News Asia, mosquito populations in some parts of Singapore have fallen by more than 90 per cent since the programme was introduced. However, there is a catch: in the short term, residents may notice more mosquitoes buzzing around. That's because mosquito numbers have to temporarily go up before the population can be driven down.

Eshana Saha is a fresh face in lifestyle and cultural journalism, bringing a refined, multidisciplinary perspective to the intersection of entertainment, fashion and holistic wellbeing. With less than a year of professional experience, she has quickly adapted to high-pressure editorial environments and currently works full-time with HT Media. Prior to this, she interned for nearly six months with Hindustan Times’ entertainment and lifestyle vertical, where she gained hands-on experience in digital reporting, trend analysis and editorial storytelling. Based in New Delhi, Eshana specialises in comprehensive coverage of major cultural moments — from international film press tours to the curated aesthetics of global fashion showcases, award shows and music-centred events. She holds a Bachelor’s degree in English from St Xavier’s University, Kolkata, and a Master’s degree in English from the University of Delhi, equipping her with a strong academic foundation and a keen ability to deconstruct complex cultural trends into clear, high-impact narratives. Beyond the red carpet, Eshana has developed a growing focus on health and wellbeing reporting. She bridges the gap between celebrity-driven trends and practical, evidence-informed lifestyle advice, ensuring her work remains both aspirational and grounded in editorial rigour. She has extensively covered the health implications of Delhi’s air pollution crisis, while also playing a key role in amplifying expert-led insights on women’s health and mental wellbeing, helping translate complex medical perspectives into informed, impactful public awareness. An artist at heart, she explores multiple creative forms — from visual arts and music to culinary experiments — and brings a creative’s eye for nuance, texture and detail to every story. Whether analysing runway dynamics or examining emerging wellness movements, she remains committed to accuracy and the highest standards of contemporary journalistic ethics.Read More