By now, you may have heard that a new, seemingly invincible strain of bed bug has been popping up across the UK. Affectionately referred to as ‘mutant bed bugs’, these pesky critters have become even more difficult to control than usual, leading to a spike in infestations across the country.
Metro broke the news that one London borough alone has had to tackle 40% more bed bug infestations this year, compared with the same period in 2025. (Though they have yet to reveal which borough – no doubt in an attempt to prevent people from avoiding it like the plague.)
It seems, with call-ins to pest-control experts on the rise, that something is afoot – it appears these ‘mutant bed bugs’ are a whole new kettle of fish, with experts finding they have become resistant to regular forms of insecticide. So, with these seemingly indestructible bugs dominating headlines, I’ve been chatting with experts to help separate fearmongering from the truth, so we can get to the bottom of what these so-called mutants are, if they’re dangerous and, most importantly, how to make sure they stay well away from us.
What are ‘mutant bed bugs’?
‘“Mutant” is a catchy headline but not a particularly helpful scientific term,’ according to Professor Hart, an entomologist and professor of science communication at the University of Gloucestershire, who insists a more accurate (albeit less attention-grabbing) description is ‘insecticide-resistant’ bed bugs.
‘Resistance evolves gradually through natural selection as the few bugs with genes that help them survive pass those genes on to future generations,’ Professor Hart continues. Explaining that, while it’s impressive and a little concerning that these bed bugs have learned to become resistant to insecticides, it is entirely natural – not a super-villain origin story.
‘Whenever the same insecticides are used repeatedly, there’s strong selection for any bugs that happen to be less susceptible. Over multiple generations, those resistant individuals become more common, making the insecticide progressively less effective.’ And that’s how we end up with ‘mutant’ bed bugs.
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But, because of this resistance, it does make them much harder to control and easier for them to spread, hence the upheaval in infestations.
Adam Juson, founder of Merlin Environmental, agrees. ‘Bed bugs aren’t getting bigger or more dangerous,’ he says, ‘but they are developing resistance to traditional control measures.’ It’s reassuring news for anyone imagining a horror-film scenario, but it does explain why pest control experts are seeing more difficult-to-treat infestations.
Are they a threat?
While, technically, these bed bugs are no different to the regular kind – causing skin reactions, severe itching, sleep disruption and general grossing out – this new strain is, however, capable of doing so on a much larger scale and with greater speed, resulting in much more expensive treatments.
‘People should take bed bugs seriously, but there’s no need to panic,’ assures Professor Hart. ‘They’re a nuisance, rather than a major public health threat, and while resistance can make them more difficult to control, effective treatment is still possible.’ Phew! So, they’re majorly gross and a pain to get rid of, but at least they’re not a danger to our health.
There’s another common misconception worth busting, too: bed bugs aren’t attracted to dirty homes – they’re attracted to people. ‘They infest immaculate homes and hotels just as readily as anywhere else,’ says Adam, so finding them isn’t a reflection of your cleaning habits (good to know!).
The number one tip for preventing bed bugs
If you’re wondering why bed bug infestations seem to thrive during the summer months, it’s not actually due to the weather. ‘Modern travel is probably one of the biggest factors,’ claims Professor Hart. ‘Bed bugs are excellent hitchhikers and can easily move between hotels, luggage and homes.’
The key to prevention lies in how you behave when you return home. The number one anti-bed bug rule? Never put your suitcase on your bed. A common mistake I’m sure, but putting your now-grubby case on any upholstery is a really easy way to invite bed bugs to settle into the fibres of your home.
‘Inspect hotel beds and headboards for signs of bed bugs, keep luggage off the bed and, ideally, on a luggage rack, and check your suitcase before returning home,’ says Professor Hart. Make sure to thoroughly wipe down and disinfect your suitcase the moment you get home, whether you suspect bed bugs or not – it’s just generally good housekeeping.
How to prevent bed bugs
As Professor Hart says, this mutation in bed bugs across the UK ‘can make control more challenging, but it doesn’t make bed bugs impossible to eradicate’. So, there are still many ways you can prevent these resilient little critters from getting in your homes and driving up that pest-control bill.
According to Professor Hart, ‘Successful control increasingly relies on a combination of careful inspection, physical removal, heat treatments where appropriate and targeted professional pest control, rather than simply relying on sprays.’
Washing and tumble-drying clothes on a high temperature setting after travelling is also an essential step for bed bug prevention.
Panicking is also not the answer. Dr Richard Naylor, bed bug technical expert at The Bed Bug Foundation, warns that reaching straight for a DIY spray can actually make matters worse. ‘Spraying weak over-the-counter insecticides at bed bugs can cause them to disperse,’ he explains, meaning they spread into more hiding places instead of being eliminated.
With all the loud headlines stirring up concern, it’s easy to jump to conclusions, but Professor Hart also urges calm and composure. ‘First, confirm that bed bugs are actually present by looking for the insects themselves or signs such as dark faecal spots, cast skins or blood spots on bedding,’ says Professor Hart. ‘If the infestation is confirmed, contacting a professional pest controller early usually gives the best chance of successful treatment.’
Top tips for bed bugs at a glance
- Check your mattress regularly Look for live bugs, tiny black spots, shed skins or rust-coloured stains around mattress seams and the bed frame.
- Be travel-savvy Keep suitcases off hotel and your own beds and, when you get home, wash clothes on a hot cycle before putting them away.
- Inspect second-hand furniture Carefully check used beds, sofas and other upholstered furniture before bringing them into your home.
- Use heat to your advantage Wash bedding and clothing at 60°C where possible and tumble dry on a high heat (if care label allows) to help kill bed bugs and their eggs.
- Vacuum little and often Pay particular attention to mattresses, bed frames, skirting boards and cracks. Empty the vacuum outside immediately afterwards.
- Don’t rely on DIY sprays alone Insecticide-resistant bed bugs can survive many over-the-counter treatments, so persistent infestations usually require professional pest control.
Remember: they’re unpleasant, not dangerous – bed bugs aren’t known to spread disease, but their bites can be itchy and infestations can cause stress and sleep disruption, so get ahead where you can this season.
