Acute HIV infection: The body’s initial reaction to infection by the HIV virus. Acute HIV infection is a flu-like syndrome that occurs immediately after a person contracts HIV (the human immunodeficiency virus 1, the agent that causes AIDS). The syndrome is characterized by fever, sore throat, headache, skin rash and swollen glands (lymphadenopathy).
This syndrome precedes seroconversion — the development of detectable antibodies to HIV in the blood as a result of the infection. It normally takes several weeks to several months for antibodies to the virus to develop after HIV transmission. When antibodies to HIV appear in the blood, a person will test positive in the standard ELISA test for HIV.
- ADA (American Diabetes Association)
ADA (American Diabetes Association): The American Diabetes Association (ADA) provides the following introduction: “The American Diabetes Association is the nation’s leading nonprofit health organization providing diabetes research, information and advocacy. Founded in 1940, it was reorganized in 1969 to increase its ability to serve the public. Today, offices in more than 800 communities conduct programs […]
- ADA deficiency
ADA deficiency: Lack of normal adenosine deaminase (ADA) activity, a genetic (inherited) condition causing one form of severe combined immunodeficiency ((SCID) disease. It is said to be “combined” in that there is dysfunction of both B and T lymphocytes with impaired cellular immunity and decreased production of immunoglobulins. Adenosine deaminase is an enzyme that plays […]
- Adam's apple
Adam’s apple: The familiar feature on the front of the neck that is the forward protrusion of the thyroid cartilage, the largest cartilage of the larynx. It tends to enlarge at adolescence, particularly in males. It is usually said to take its name from the extrabiblical story that a piece of the forbidden fruit stuck […]
Adamantine: In dentistry, relating to the enamel of the teeth. Adamantine comes from the Greek and Latin word adamas which applied to substances having the hardness or luster of a diamond. Adamantine figuratively means unyielding and inflexible.
- Adams-Stokes disease
Adams-Stokes disease: Sudden collapse into unconsciousness due to a disorder of heart rhythm in which there is a slow or absent pulse resulting in syncope (fainting) with or without convulsions. In this condition, the normal heartbeat passing from the upper chambers of the heart to the lower chambers is interrupted. This results in a condition […]