In medicine, the time from the moment of exposure to an infectious agent until signs and symptoms of the disease appear. For example, the incubation period of chickenpox is 14-16 days.
In biology, the incubation period is the time needed for any particular process of development to take place. For example, the length of time for turtle eggs to hatch is the incubation period.
- Periodic abstinence
Also known as fertility awareness, natural family planning, and the rhythm method, this approach entails not having sexual intercourse on the days of a woman’s menstrual cycle when she could become pregnant or using a barrier method (such as a condom, the diaphragm or a cervical cap) for birth control on those days. Because a […]
- Periodic breathing
Clusters of breaths separated by intervals of apnea (no breathing) or near-apnea. As opposed to normal breathing which is usually regular. Periodic breathing was originally thought to arise from serious neurologic or cardiovascular disease and therefore to carry a poor outlook. It is now known that periodic breathing also tends to occur during sleep, it […]
- Periodic fever
Recurrences of fever that last from a few days to a few weeks and are separated by symptom-free intervals of varying duration. This pattern of fever can be caused by recurrent infection, malignancy or noninfectious inflammatory disorders. Periodic fever that lasts for more than two years is rarely due to a malignancy or an infection. […]
Having to do with the gums and supporting structures of the teeth.
- Periodontal disease
A bacterial infection that destroys the attachment fibers and supporting bones that hold the teeth in the mouth. Left untreated, periodontal disease can lead to tooth loss. The main cause of periodontal disease is bacterial plaque, a sticky, colorless film that constantly forms on teeth.