Found One Bed Bug? What It Means and What to Do Next

TL;DR

• One bed bug doesn't always mean an infestation. It can be a hitchhiker that came in on luggage, clothing or furniture, or the first sign of a small hidden population.
• Don't crush it. Put it in a small, leak-proof jar covered with 70% rubbing alcohol so it can be identified.
• Inspect the bed first: mattress seams, piping and tags, then the bed frame and headboard. Look for dark spots, skins, tiny white eggs and live bugs.
• Put interceptors under the bed legs and check them and your sheets every few days for several weeks. Bites can take as long as 14 days to appear (Health Canada).
• Found a second bug, eggs, dark spots, shed skins or new bites? That means an infestation.
• Need help? Get a quote from a recommended local exterminator through Pest Agent's referral form.

Finding one bed bug does not automatically mean your home is infested, but squashing it and flushing it away destroys the one piece of evidence that can settle the question. A single bug can be a hitchhiker that rode in on a suitcase or a second-hand chair, or the first visible member of a group already hiding in the bed frame.

Which of the two you are facing decides what comes next, from a week of monitoring to a call to a professional. Bed bugs stay out of sight so well that one sighting rarely tells the full story on its own.

Does Finding One Bed Bug Mean You Have an Infestation?

Finding one bed bug does not always mean you have an infestation, but it is never something to ignore, because bed bugs are experts at staying out of sight. One bug can mean two very different things: a single traveller that has not settled in yet, or a small population that is only starting to show itself.

When One Bed Bug Is Just a Hitchhiker

One bed bug is sometimes just a hitchhiker. Health Canada notes that bed bugs are easily moved on infested objects, and HealthLink BC explains that they can hitch a ride on clothing, backpacks, luggage and books. If you found the bug shortly after a trip, a hotel stay, a visit from guests or the arrival of a second-hand couch, it may have come in with that item and not had time to settle and breed. Our guide on how bed bugs spread explains the usual routes.

Why One Bed Bug Can Point to More

One bed bug can point to more because bed bugs are very hard to see. According to Health Canada, their eggs are white, about 1 mm long and almost impossible to see on most surfaces, and young bed bugs are only about 1.5 mm long. Their flat bodies let them hide in tiny spaces: the US EPA says that if a crack can hold a credit card, it can hide a bed bug.

Bites are not a reliable clue either. Health Canada says a bite can take as long as 14 days to appear, and the University of Kentucky reports that about 30 percent of people do not react even when bitten repeatedly. So "no bites" does not prove you only have one bug. If you have the opposite problem, bites but no bugs, read our guide on having bed bugs but not finding them.

Can One Bed Bug Start an Infestation?

One bed bug can start an infestation if it is a female that has already mated. Genetic research at NC State University found very little diversity inside infestations, which suggests that they start from just one or two introductions of the insect. A later study of 21 infestations reached a similar conclusion: most were probably started by a single mated female and her offspring.

The numbers explain why. Health Canada says a female lays at least 200 eggs in her lifetime, at about 2 to 4 a day, and the eggs usually hatch in 6 to 17 days. The University of Kentucky adds that bed bugs can mature in as little as a month in good conditions. That is why a "one bed bug infestation" can grow quietly for weeks before you notice it. For the full timeline, see how long it takes for a bed bug infestation to show up.

Is the Bug You Found Really a Bed Bug?

A bed bug is a flat, oval, wingless insect about 5 to 7 mm long, roughly the size of an apple seed. Before you change your whole routine, make sure that is what you found, because several common household insects look similar.

What an Adult Bed Bug Looks Like

An adult bed bug is brown when it has not fed and darkens to a blood red colour after feeding, according to Health Canada. Unfed adults are very flat, like an apple seed (Purdue University), and Health Canada says adults can reach up to 10 mm. Bed bugs have no wings, cannot fly or jump, and cannot easily climb metal or polished surfaces.

What Baby Bed Bugs Look Like

Baby bed bugs (nymphs) are shaped like adults but smaller and lighter in colour. Health Canada gives their length as about 1.5 mm, and the US EPA notes that an unfed nymph can be nearly invisible to the naked eye. Nymphs are so easy to miss that finding one is a reason to inspect especially carefully.

Bugs Often Mistaken for Bed Bugs

Bugs often mistaken for bed bugs include carpet beetles, young cockroaches and ticks, according to the University of Kentucky and the US EPA. Carpet beetles are rounder and often patterned, and they do not bite people. The trickiest look-alike is the bat bug, a close relative that feeds on bats. Colorado State University explains that bat bugs have longer hairs just behind the head than bed bugs, and that they are usually found one at a time on upper floors near a bat roost, while bed bugs stay near beds and are often seen in groups. If you found a single bug near an attic, a chimney or a wall where bats live, ask for a professional identification.

How to Keep the Bug for Identification

Keeping the bug is the best way to get a sure answer. HealthLink BC advises trying to collect a bed bug for identification and contacting a pest control professional or your local health authority for help. Purdue University's entomology lab recommends this method:

1. Place the bug in a small, leak-proof jar or vial.
2. Cover it with 70% rubbing alcohol, which kills and preserves it.
3. Do not crush it, and do not tape it to paper, since a damaged bug is hard to identify.
4. Write down where and when you found it.

A clear, close-up photo taken before you capture it also helps a professional give you a first opinion.

Where Should You Look After Finding One Bed Bug?

After finding one bed bug, inspect the bed first, because bed bugs hide close to where people sleep. Work slowly, with good light, and check both for live bugs and for the marks they leave behind.

Signs of Bed Bugs

Signs of bed bugs are often easier to find than the bugs themselves. The US EPA, HealthLink BC and the University of Kentucky list these:

• Dark spots of dried droppings that may bleed into fabric like a marker
• Rusty or reddish stains on sheets or the mattress from crushed bugs
• Tiny white eggs and pale yellow or tan skins shed by growing nymphs
• Live or dead bed bugs

The Mattress

The mattress is the first place to check. The US EPA says to look along the piping, seams and tags of the mattress and box spring. Lift the sheets and the mattress cover, and run your light slowly along every seam, especially near the head of the bed.

The Bed Frame

The bed frame and headboard come next. The University of Kentucky notes that bed bugs often hide in the seams, folds and crevices of the bed frame and headboard, and that a thorough check may mean taking the bed apart. Look at joints, screw holes and the back of the headboard.

Upholstered Furniture

Upholstered furniture near the bed, or any couch where someone sleeps or naps, can also hide bed bugs. The US EPA lists the seams of chairs and couches, the space between cushions and the folds of curtains as hiding spots in heavier infestations.

Your Luggage

Your luggage deserves a close look if you travelled recently, since the University of Kentucky describes bed bugs as efficient hitchhikers carried into homes on luggage. Check the seams, pockets and lining, and keep the suitcase off the bed while you do.

Inspection Tools

Inspection tools do not need to be special. A flashlight helps in dim areas (University of Kentucky), a magnifying glass helps you see eggs and small nymphs, and a thin card can sweep bugs out of cracks and seams. For a room-by-room list, see where bed bugs hide.

What Should You Do After You Found a Bed Bug?

After you found a bed bug, take a few simple steps the same day to remove any hidden bugs from your bed and to catch any others that are out there. None of these steps require pesticides.

Do Not Throw Out Your Mattress Yet

Throwing out your mattress after finding one bed bug is usually unnecessary and can make things worse. Health Canada notes that bed bugs are easily moved from room to room on infested objects, so dragging a mattress or couch through your home can spread them. Keep the bed where it is, inspect it and protect it instead.

Heat-Dry Your Bedding

Heat-drying your bedding kills any bed bugs or eggs hiding in it. Health Canada advises putting items in a hot dryer for 30 minutes or more, and HealthLink BC recommends washing bedding in hot water and drying it on the hottest setting. Carry the sheets to the laundry in a sealed bag so nothing drops on the way.

Vacuum the Bed

Vacuuming the bed removes bugs and eggs you cannot see. Health Canada recommends using a stiff brush attachment with a back-and-forth scraping motion along the mattress. The Quebec government points out that vacuuming reduces the number of bed bugs but does not kill them, so seal the vacuum bag or contents in plastic and put them in an outdoor bin right away.

Put Interceptors Under the Bed Legs

Interceptors are small plastic dishes that go under each bed leg and catch bed bugs as they crawl to or from the bed. Health Canada describes them as a way to detect bed bugs, and Rutgers University found interceptors much more effective than visual inspections. Rutgers advises pulling the bed away from the wall and keeping bedding off the floor so the legs are the only way up, and leaving interceptors in place for at least a week or longer to detect bed bugs at very low numbers.

Encase the Mattress

Encasing the mattress and box spring in zippered, bed-bug-proof covers traps any bugs inside and removes many hiding spots. Health Canada says it is good practice to keep the mattress enclosed for a full year. Encasements do not stop bugs from crawling onto you from elsewhere, as the University of Kentucky points out, so use them with interceptors, not instead of them.

Hold Off on Bug Sprays

Holding off on bug sprays is wise until you know you have more than one bug. Health Canada says to use only pesticides registered by Health Canada and only as directed on the label, and the Quebec government warns that self-treatment can be unsafe if misused and can increase resistance. The University of Kentucky notes that bed bugs are becoming increasingly resistant to pesticides. If you do buy a product, check the label for a PCP number and keep children and pets away from treated areas. Our best bed bug spray guide compares products sold in Canada.

Found 1 Bed Bug and Nothing Else?

If you found 1 bed bug and nothing else, keep monitoring rather than relaxing right away. Check the interceptors and your sheets every few days for several weeks. If the interceptors stay empty, no new bites appear and you find no spots, skins or eggs, the bug was most likely a hitchhiker. If anything turns up, move to the next section.

When Should You Call a Pest Control Professional?

Calling a pest control professional makes sense the moment you find a second bed bug or any other sign of activity. Health Canada strongly recommends hiring a licensed professional pest control operator to treat bed bugs, and HealthLink BC notes that several treatments are usually needed.

Signs It Is More Than One Bed Bug

Signs that you have more than one bed bug include a second bug anywhere in the home, bugs in the interceptors, dark spots or shed skins on the mattress, eggs, or new bites that keep appearing. Any of these means you are dealing with a bed bug infestation, not a hitchhiker. Our bed bug infestation guide covers the full treatment plan.

What a Professional Inspection Involves

A professional inspection starts with a careful visual check of beds, furniture and baseboards, often with high-intensity flashlights. Some Canadian pest control companies also offer detection dogs trained to alert to live bed bugs and eggs, followed by a visual check by the handler. Read what exterminators do for bed bugs to know what to expect, and get a quote from a recommended local exterminator through Pest Agent's referral form before you book.

If You Rent

If you rent, tell your landlord or property manager as soon as you confirm a bed bug, since bugs can travel between units. In Quebec, the provincial government says tenants must immediately inform the owner and the owner must promptly contact an extermination company. Rules differ elsewhere in Canada, so see our guide on who pays for bed bug extermination. For more guides on identifying, preventing and treating bed bugs, visit the bed bug hub.