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Definition Tay-Sachs disease is a genetic disorder that destroys the nerve cells in the brain and the spinal cord. It is caused by the deficiency of an enzyme hexosaminidase A. Thus it accumulates much fat and lipids called as gangliosides in brain and nerve cells. This leads to loss of …

Definition Tourette’s syndrome is a nervous system problem with tics like vocalization (vocal tic) and repetitive movements of muscles (motor tic). In particular, a person may frequently blink their eyes, babble offensive words, blurts out unusual sounds. Tics generally appears in kids between 2 – 15 years old, mostly in …

Introduction People with thrombocytopenia have diminished platelets (Thrombocytes) count in the blood. Platelets are blood cells which help for clotting process. Normal platelets count value is from 150,000 and 450,000 per microliter (one-millionth of a liter). About two-third of platelets are released into the blood stream whereas the remaining are …

Definition Tuberculosis (TB) is a disease which in humans is usually caused by bacteria called Mycobacterium tuberculosis (M. tuberculosis). TB is an abbreviation of the word Tuberculosis and is how people often refer to the disease. Bovine TB is a disease caused by similar bacteria called Mycobacterium bovis (M. bovis). …

Definition Tetanus is an acute, often-fatal disease of the nervous system that is caused by nerve toxins produced by the bacterium Clostridium tetani. This bacterium is found throughout the world in the soil and in animal and human intestines. The bacterium can also lay dormant in its spore form for …

Definition Typhoid fever is caused by Salmonella typhi bacteria. Typhoid fever is rare in industrialized countries. However, it remains a serious health threat in the developing world, especially for children. Typhoid fever spreads through contaminated food and water or through close contact with someone who’s infected. Signs and symptoms usually …

Definition Tularemia is a rare infectious disease that typically attacks the skin, eyes, lymph nodes and lungs. Tularemia also called rabbit fever or deer fly fever is caused by the bacterium Francisella tularensis. The disease mainly affects mammals, especially rodents, rabbits and hares, although it can also infect birds, sheep, …

Definition Trichinosis is a disease caused by parasitic roundworms (nematodes) that can infect and damage body tissues. Nematodes are a major division of the helminth family of parasitic worms (for example, Trichinella spiralis). When ingested, these parasitic worms can pass through the intestinal tract to invade other tissues, such as …