PCD, or Kartagener syndrome, is a genetic disorder that causes hair-like cells called cilia to move improperly, or in some cases, not at all. Cilia are needed to help clear the respiratory system of pollutants. When they work properly, they move debris-filled mucus into the large airways, allowing the debris to be coughed out of the body. When the cilia do not work properly, the body cannot rid itself of debris and is left vulnerable to serious infections in the sinuses, ears, and lungs. Over time, repeated infections can lead to scarring and permanent obstruction of these body areas. This study will determine when PCD starts and how it changes over time, specifically in terms of how well the lungs work, what germs grow in lung secretions, and how the lungs look on CT scans. This research may lead to a better understanding of PCD and thereby help doctors improve clinical management of the disease.