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Primary ciliary (SIL-e-ar-e) dyskinesia (dis-kih-NE-ze-ah), or PCD, is a rare disease that affects tiny, hair-like structures that line the airways. These structures are called cilia (SIL-e-ah).
Cilia move together in wave-like motions. They carry mucus (a slimy substance) toward the mouth to be coughed or sneezed out of the body. The mucus contains inhaled dust, bacteria, and other small particles.
If the cilia don't work well, bacteria stay in your airways. This can cause breathing problems, infections, and other disorders. PCD mainly affects the sinuses, ears, and lungs. Some people who have PCD have breathing problems from the moment of birth.
Sperm cells have structures that are like cilia. In men