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Obstetrician-Gynecologist
A physician with special skills, training and education in women's health.
Obstetrics
The branch of medicine that involves care of a woman during pregnancy, during labor and delivery, and after childbirth.
Ocular herpes
Herpes infection in the eyes.
Off-Label
Use of a drug for a disease or condition other than the indication for which it was approved by the FDA. For example, many doctors prescribe paromomycin (humatin) for cryptosporidiosis, although it is not approved for treating this disease.
Oncologist
A doctor who specializes in treating cancer.
Open-Label Trial
A study in which both researchers and participants know what drug a person is taking and at what dose.
Opportunistic Infections (OI)
Infections that occur in persons with weak immune systems due to AIDS, cancer or immunosuppressive drugs such as corticosteroids or chemotherapy. PCP, toxoplasmosis and cytomegalovirus are all examples of OIs.
Oral Hairy Leukoplakia (OHL)
A whitish lesion that appears on the side of the tongue and inside cheeks. The lesion appears raised, with a ribbed or 'hairy' surface. OHL occurs mainly in people with declining immunity and may be caused by Epstein-Barr virus infection.
Oral-facial herpes
The presence of latent herpes simplex infection in the trigeminal ganglion, at the top of the spine. When reactiviated, oral-facial herpes can cause symptoms anywhere on mouth or face
Organism
Any individual living thing, whether animal or plant. Each STD is caused by one or more specific organisms.
Ovaries
The pair of female reproductive glands in which the ova, or eggs are formed. The ovaries are located in the lower abdomen, one on each side of the uterus.
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