Seeing a rat cross your kitchen triggers two reflexes: emergency-bought poison and a hole plugged with expanding foam. Both backfire. Here is what actually helps in the first hours — and why a rat visible in daylight is a signal to take seriously.
The three useful steps tonight
Put food out of reach: everything edible goes into sealed containers (glass, metal, hard plastic) or the fridge — including the dog's bowl, the kibble bag and the bin, which now closes with a lid. A rat deprived of food moves around more and gets spotted, which speeds up the diagnosis.
Close interior doors and block the gap under the door of the affected room with a towel: you limit its territory for the night without trapping it inside a wall.
Observe without cleaning: note where you saw the animal, photograph the droppings (12–18 mm for a rat, 3–6 mm for a mouse) and the grease marks along the skirting boards. These clues show the technician the movement routes and the likely entry point — cleaning them before the visit removes their best information.
The two mistakes that make it worse
Plugging the hole right away: if the animal is still inside, you have locked it in your home. A trapped rat gnaws whatever surrounds it — cables, pipes, partitions — and eventually dies somewhere inaccessible, with the smell that follows for weeks. Sealing comes at the end of the treatment, never at the start.
Scattering consumer poison on the floor: over-the-counter rodenticides are weaker than professional products, and a rat is neophobic — it avoids anything new in its environment for days. The frequent outcome: the product sits within reach of children and pets without ever being touched. Professionals work with locked bait stations and products restricted to professional use.
A rat in daylight: what it means
The brown rat (Rattus norvegicus) is nocturnal and shy. Crossing paths with one in broad daylight usually means the population is dense enough that competition pushes individuals out at unusual hours — or that a construction site, a sewer flood or nearby works have displaced a colony.
In both cases, the animal you saw is rarely alone. Acting fast keeps a colony that is settling in from becoming a weeks-long job: the younger the infestation, the shorter the treatment.
The risks to know about, without panic
The main health risk linked to rats in Belgium is leptospirosis, transmitted through urine — around 20 human cases a year according to Sciensano. The right reflexes: don't handle the animal or its droppings with bare hands, wash kitchen surfaces before reusing them, and throw away any opened food whose packaging shows gnaw marks.
The material risk is more common than the health risk: a rat gnaws continuously to wear down its incisors, and a stripped electrical cable behind a partition is a real potential fire start. That, more than fear of a bite, is the reason to treat quickly — a rat that can flee, flees.
What the technician will do
The intervention starts with the inspection: identifying the species, the movement routes and above all the entry point — sewer connection, cellar vent, garage door, pipe penetration. That diagnosis is what separates a lasting treatment from blind baiting.
Then: secured bait stations placed along the identified routes, out of reach of children and pets, a follow-up to confirm activity has stopped, and finally the sealing of access points. Antinox intervenes within 24h in Brussels and Wallonia, with a re-intervention guarantee if activity resumes during the covered period.
Frequently asked questions
Can a rat attack me or bite my children?
A rat with an exit always flees humans. Bites almost always involve a cornered or handled animal. Don't try to catch or corner it: leave it an escape route and close off the room.
Will the rat leave on its own?
If it has found food and shelter, no — it settles the colony in. A rat that entered by accident (open door, nearby construction) may leave on its own, but repeated droppings or grease marks signal settlement, not a passage.
Can I wait until next weekend to act?
Every week counts: a female rat's gestation is about three weeks, with several litters a year. A presence treated in the first days remains a simple intervention; the same presence a month later can be a colony.
Rat or mouse — how can I be sure before calling?
Dropping size settles it: 3–6 mm is a mouse; 12–18 mm a rat. On the phone, describe what you saw and photographed: the protocol and products differ by species, and the on-site assessment confirms.