AIDS-related complex (ARC) was introduced after discovery of the HIV (human immunodeficiency virus) when the medical community became aware of the inherent difficulties associated with treating patients suffering from an advanced case of HIV which gave rise to the term acquired immune deficiency syndrome (AIDS). The necessity for doctors to quickly and accurately understand the special needs of unknown patients suffering from AIDS in an emergency department situation was addressed with the creation of the term ARC.ARC is a "prodromal phase of infection with the human immunodeficiency virus (HIV)" that includes: low grade fever, unexplained weight loss, diarrhea, opportunistic infections and generalized lymphadenopathy. [Source: Wikipedia 
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