How Dangerous Are Rats?

While they might look docile, rats are far from being harmless to be ignored. Not only can they cause a fair bit of damage to your home, property & office with their constant gnawing, but they can also cause some infectious diseases & serious health complications

Rodent borne diseases come in all shapes and sizes from bacteria-based illnesses such as salmonella to viruses such as hantavirus. These diseases are quite nasty and an inconvenient thing to contract. They are commonly transmitted by rats and mice, they can enter your home in search of food & shelter which will lead to an infestation.

• Direct Contact: You can catch these diseases by coming into direct contact with their urine, this can be by touching it or touching something that has been contaminated. 
• Contaminated Food: This is contracted via contaminated food and water. This happens when a rat or mouse urinates on a food source or water supply. 
• Contaminated Air: You can also catch a rodent-borne disease from inhaling dust that has been contaminated by their urine.
• Open Wound: If you have an open wound or scratch, which isn’t properly dressed, then you could be at risk of catching an infection if your wound/scratch comes into contact with rodent urine.

• ---

  How dangerous are rats in your house?

  Rats pose a dual threat: physical damage and serious health risks. Structurally, their need to gnaw on hard materials means they can chew through floorboards, PVC pipes, and most dangerously, electrical wiring, which is a leading cause of house fires. From a health perspective, they are vectors for various pathogens that can be transmitted through their urine, droppings, and hair.

• ---

  Are rats in Ireland dangerous?

  Yes. The two most common species in Ireland are the Brown Rat (Rattus norvegicus) and the Black Rat (Rattus rattus). Both carry Leptospirosis (Weil’s Disease), which is a significant concern in Ireland, particularly near waterways or damp farm buildings. They also carry Salmonella, Listeria, and parasites like fleas and ticks that can affect both humans and domestic pets.

• ---

  Do rats go near sleeping humans?

  While rats are naturally "neophobic" (wary of new things) and generally avoid humans, they are opportunistic. If a bedroom has a source of food or if the infestation is heavy, a rat may venture near a sleeping person. However, they do not seek out humans; they are usually searching for food or nesting materials. Bites are rare and typically occur only if a rat feels cornered or threatened.

• ---

  What smell do rats hate?

  Rats have a highly developed sense of smell. They are known to dislike the pungent scents of peppermint oil, eucalyptus, and citronella. Some also suggest that the smell of ammonia or mothballs acts as a deterrent.

  Professional Note: While these scents might discourage a rat from a specific corner, they will not drive an established colony out of a warm Irish home with a steady food source.

• ---

  What is a rat's biggest enemy?

  In the wild, a rat's primary predators are birds of prey (owls and hawks) and foxes. In a domestic setting, terriers and cats are their traditional enemies. However, their "biggest enemy" in an urban environment is lack of resources. By removing access to water, shelter, and food (like poorly stored birdseed or overflowing bins), you make your property an inhospitable environment for them.

• ---

  Do rats come back to the same place?

  Rats are creatures of habit. They use pheromones in their urine to mark "safe" trails for themselves and other members of the colony. If a nesting site is cleared but the entry points aren't sealed and the pheromone trails aren't cleaned, new rats will likely follow the scent back to the same location. This is why professional sanitation and "proofing" are essential.

• ---

  What time of year is the worst for rats?

  In Ireland, autumn and winter are the peak seasons for indoor rat problems. As the temperature drops and the fields become waterlogged, rats seek the warmth and dry conditions of Irish lofts, cavity walls, and sheds. However, breeding occurs year-round, so an infestation can start at any time.

• ---

  What gets rid of rats permanently?

  Getting rid of rats permanently requires more than just traps; it involves a combination of professional-grade elimination and robust property "proofing." Since rats can squeeze through a gap the size of a €2 coin, you must seal all structural cracks, pipe gaps, and vents with durable materials like wire wool or metal plating.

  In Ireland, many infestations begin in the sewers, so installing a one-way "rat valve" in your drains provides a permanent barrier against pests entering from the mains. Finally, you must remove external attractants by securing bins and clearing overgrown vegetation to ensure your home remains inhospitable to new colonies.