HIV
Human Immunodeficiency Virus attacks the human immune system, killing the cells that combat disease and infection.
AIDS
Acquired Immune Deficiency Syndrome is the extremely advanced stage of HIV. AIDS is not actually different from HIV, it is just HIV evolved to the point where the human immune system is vulnerable to over 25 different diseases called Opportunistic Infections (OI's).
Antiretroviral Drugs
Drugs that combat retroviruses.
Combination Therapy
The use of more than one drug to combat HIV. Due to its rapid and complex replication process, one drug alone is not enough to truly combat the disease. The use of more than three drugs simultaneously is known as HAART, Highly Active Antiretroviral Therapy.
Immune System
The cell network in the human body that combats foreign substances, pathogens, disease, infection, etc. Without the immune system, people could be killed by the common cold.
Immunity
The ability to be completely impervious to a disease or infection.
Retrovirus
A virus that has the ability to perform "reverse transcription", the conversion of DNA into RNA as opposed to RNA-DNA. Certain cancers are also considered retroviruses.
White Blood Cells
Colorless cells in the blood that help combat infection. Some white blood cells act as scavengers by engulfing foreign particles (such as bacteria) and destroying them. Others produce antibodies or destroy dead cells.
Sources
http://www.dictionary.com

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