How Mites Choose a Host and Why They Chose You.
Frequently Asked Questions
Having a family member or friend with parasitic mites can be confusing. The affected person claims to be infested, yet the mites are not visible and there are often no physical signs. Here are some questions and answers that may help.
Bird mites are notoriously hard to catch. They are the size of the point of a pin, translucent, and quick moving. The glue traps used for mites don’t have pheromones, like moth traps do, so they don’t attract mites. Mites respond strongly to pheromones, so it would be a big improvement if mite traps were baited with pheromones.
Researchers working with scavenger face mites (which we all have) developed a way of capturing mite DNA from human skin using strong glue. Then they sequence the DNA to find the species. If this method starts being used for parasitic mites, it will become easier to help people with bird mites.
If my family member has mites, why are there no bite marks?
When a mite ingests living blood, the blood mounts an immune response from inside the mite’s gut. When any parasite ingests blood, it leaves behind proteins in the host. Mites have evolved to leave behind a protein that suppresses the immune system of the host, so the mite won’t be attacked by its food. One effect of immunosuppression is that bite marks are less pronounced (or nonexistent) when a host has been bitten by mites for months.
If one family member has mites, why don’t other people in the family have them?
Agricultural bulletins advise farmers who think their flock may have mites to take several chickens to the veterinarian. This is because there is a big variation in the level of infestation of different individuals. The tendency to choose just one chicken is adaptive for mites, who cluster on one bird in a flock and bleed it to the point where it is a stationary meal.
There is no reason mites infesting a human family would behave differently than they do when they choose a favorite chicken.
My doctor/pesticide professional says chicken mites don’t bite people, and/or can’t reproduce on human blood. Is that true?
An article published in a 1958 science journal documented finding human blood cells in mite intestines. The only way those cells got there is for “bird mites” to feed on human blood. It is surprising that misinformation about mites has persisted for decades.
Leading mite experts acknowledge that what we call “bird mites” can reproduce when they feed on human blood. These mites can adapt to a variety of species.
Our house has already been treated for mites. Why does my family member still claim to get bitten?
Farmers know how hard it is to get rid of mites in a chicken coop. Sometimes the only way is to burn it to the ground, and then treat the dirt where the coop stood. Treatment isn’t easy in a human home, either.
Mites rapidly evolve resistance to pesticides. In addition, mites can hide inside books, wood paneling, etc., during pest treatment. Pest control professionals realize there is no test to prove that a building no longer has mites. As a result, a pest control company typically will refuse to represent in writing that the mites in a treated building are gone. The most accurate way to check the effectiveness of pest control efforts is to treat a home and then see if a susceptible person is still bitten.
How do you get rid of mites and how long does it take?
The key to getting rid of mites is to kill them faster than they can reproduce. And because the host and the environment are co-infested, both must be addressed at the same time.
Killing mites involves:
Frequent and thorough cleaning of the body and the dwelling