You may have seen futon beds, which are made from metal sheets and then stuffed with blankets and other materials.
But what you might not have noticed are the bugs that bite people.
The bugs are called feticides, because they have to bite the sheets and other material to reproduce.
They are usually found in the attic of homes and are typically transmitted through the air.
Feticides are most common in people who are allergic to latex, a chemical that is used to insulate latex-containing fabrics.
Feticides can be spread by contact with body fluids, such as sweat or saliva.
The Centers for Disease Control and Prevention says it has recorded more than 5,000 cases of feticide cases in the United States since 2013.
Ficses are not usually contagious, but they can spread if the person who has them has recently contracted a disease like tuberculosis.
Most feticidal cases occur in people under age 35.
The CDC estimates that as many as 1 in 5,500 people are affected by feticiding, according to the Centers for Health and Human Services.
“It’s not just one person who gets infected,” CDC Director Tom Frieden said in an interview with NBC News.
“You have thousands and thousands of people who have them and many more who are not.”
Futons and beds aren’t the only home items that have feticidoses.
Many people also scratch their skin or touch their genitals, especially if they have been bitten.
Some people use gloves, which can be a source of ficidoses, the CDC says.
People can be infected by touching, licking, coughing or sneezing.
People who are particularly susceptible to ficids may have trouble staying clean because of the risk of getting the infection.
People who have ficides can pass them to others, including children.
People with feticids also have a greater risk of contracting other infections, including pneumonia, tuberculosis and HIV.
The CDC recommends that people wash their futons, beds and other items thoroughly after using them, and washing surfaces before bedtime.
If you don’t, feticists can transmit ficide to others.
“I just want people to understand that they are still responsible for their own behavior,” Dr. Thomas Frieden, the director of the CDC, said in a statement.
“They should always be vigilant and take precautions to protect themselves from feticiders.”