The place where you usually let your guard down comes right after your front door. The shoes left behind at the entrance, the dog returning from a walk, the trousers left on a chair. Right there a tiny and very stubborn problem can begin: a tick in the house. A study from Ohio State University, published in Journal of Vector Ecologyhas seen that two species of ticks brought into domestic environments can survive at least a week and, in some cases, up to about three.
The research comes from the United States and concerns two species widespread there: the lone star tick (Amblyomma americanum) and the Gulf Coast tick (Amblyomma maculatum). The former is linked to ehrlichiosis and, according to the CDC, is also associated with alpha-gal syndrome, a potentially serious allergy that can appear after the bite and make red meat and other mammalian products problematic. The second is vector of Rickettsia parkerian infection of the spotted fever group. For the most common species in Italy, dedicated studies are needed; the useful data, however, remains very strong here too: a tick that enters an apartment retains the ability to look for a guest for days.
From the hallway to the living room carpet
The researchers observed 90 ticks per species, distributed on five very common surfaces in the home: tile, wood, vinyl, short carpet and shag carpet. Each specimen was covered with a small container, so as to prevent its escape while still allowing it to move. The adults used in the study were still fasting, so they behaved like ticks that come into the house by “grabbing” on clothes or animals and are still looking for someone to feed on. In all, the team collected more than 4,600 observations.
The numbers alone are enough to put to rest many illusions. The Gulf Coast tick lasted about 18 days on average, while the lone star tick lasted around 11 days. On vinyl flooring the Gulf Coast averaged about 25 days. The lone star, however, showed her tenacity on long-pile carpets, where she reached almost 15 days; its average stay on the tile was about a week. Translated into everyday life: the corridor, the living room carpet or the room where the dog sleeps can remain at risk much longer than you might think.
The explanation comes from the body of the ticks themselves. These arthropods live by managing humidity and can go for a long time without food; in the Ohio State laboratory some control specimens, kept in ideal conditions of temperature and humidity, even survived the year. Inside the house, the dry air causes them difficulty, of course, but collapse doesn’t come quickly. And this is precisely the practical point of the study: the domestic environment does not eliminate them instantly.
Here it pays to be precise. This work talks about American species, present mainly in the eastern, southern and part of the Midwest. However, the mechanism observed is very clear: the tick that enters the house on trousers or on the fur of an animal continues to move and continues to look for a host. In short, the house offers her time. And it is precisely time that changes the perception of risk.
This is why return habits matter a lot. The CDC recommends checking clothes, showering after returning from green areas, inspecting your body, and placing clothing in the dryer on high for at least 10 minutes when dry; if they are damp or go through the washing machine first, more heat or more time is needed. Ohio State also insists on pet control, because the most banal route is that of the dog coming in, curling up on the carpet and letting his hitchhiker go.
When a tick is already attached to the skin, the CDC recommends removing it immediately with fine-tipped tweezers, grasping it as close to the skin as possible and pulling with constant pressure, without jerking. Then the area is cleaned well and any symptoms are observed in the following weeks. All very domestic, all very concrete. The living room, unfortunately, sterilizes nothing. It just offers a quiet place to wait.
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