Fleas can be quite resilient and adept at traveling from one host to another. When it comes to humans, fleas are not typically carried very far, primarily because they rely on animals like cats and dogs for their primary hosts. However, if a person has fleas on them-perhaps from being in close contact with infested pets or environments-fleas can cling onto clothing or hair and be inadvertently transported to another location.
Fleas can jump long distances relative to their size, up to 8 inches vertically and 16 inches horizontally, which makes it easier for them to migrate from one animal to another. However, when on a human, their travel distance is usually limited to the duration that they can hold onto their host. Fleas do not typically live long on humans because they prefer animal blood for feeding; their survival depends on being able to feed regularly.
In practical terms, if a person were to walk from one house to another, fleas might travel with them for a short distance, potentially up to a few hundred yards, depending on various factors like the climate and how long they can go without feeding. However, it's unlikely they would survive the journey if it took too long, as they need to find a host to feed within a couple of days.
If you suspect fleas are being carried from one house to another, it's important to address the infestation where the problem originates. This can involve treating pets and the environment, as fleas can easily reinfest areas if not controlled effectively. Regular cleaning and vacuuming can also help manage and prevent the spread of fleas indoors.