The bacterium that causes Legionnaires’ disease.
- Legionnaire disease
A disease due to the bacteria Legionella pneumophila found in plumbing, shower heads and water-storage tanks. Outbreaks of Legionella pneumonia have been attributed to evaporative condensers and cooling towers. The bacteria thrives in the mist sprayed from air-conditioning ducts and so it can infest an entire building or airplane. Travelers are especially vulnerable in the […]
- Leigh's disease
A rare, inherited disorder characterized by degeneration of the central nervous system. Leigh’s disease can be caused by mutations in mitochondrial DNA or by deficiencies of an enzyme called pyruvate dehydrogenase. Symptoms usually begin between the ages of 3 months and 2 years and progress rapidly. Early symptoms may include poor sucking ability and loss […]
A benign tumor of smooth muscle, the type of muscle that is found in the heart and uterus. A leiomyoma of the uterus is commonly called a fibroid. Uterine fibroids are the single most common indication for hysterectomy. Fibroids can be present and be inapparent. However, they are clinically apparent in up to 25% of […]
A malignant tumor that originates in smooth muscle, the major structural component of most hollow internal organs and the walls of blood vessels. Leiomyosarcoma can occur almost anywhere in the body but is most frequently found in the uterus and gastrointestinal tract. Complete surgical excision, if possible, is the treatment of choice.
- Leishmania infection
Mexico, Central America, and South America — from northern Argentina to southern Texas (not in Uruguay, Chile, or Canada) Southern Europe (leishmaniasis is not common in travelers to southern Europe) Asia (not Southeast Asia) The Middle East Africa (particularly East and North Africa, with some cases elsewhere) More than 90% of the world’s visceral leishmaniasis […]