The mitral valve controls the flow of blood into the left ventricle. Normally, when the left ventricle contracts the mitral valve closes and the blood flows out through the aortic valve.
Legionnaires' disease is a severe bacterial infection of the respiratory tract, caused by Legionella pneumophila.
Lamellar refractive keratoplasty involves the placement of a lenticule on or within the cornea to alter its refractive power, usually by changing its anterior curvature.
Hyperthyroidism (overactive thyroid) is a condition caused by too much thyroid hormone in the body. It is also known as thyrotoxicosis.
Gonorrhea is caused by Neisseria gonorrhea, a bacterium that grows and multiplies quickly in moist, warm areas of the body such as the cervix, urinary tract, mouth, or rectum.
Genital herpes is a viral infection characterized by outbreaks of painful sores on the genitals. Most often it spreads through sexual contact.