HIV (human immunodeficiency virus) is the virus that causes AIDS (Acquired Immunodeficiency Syndrome). HIV is a contagious disease that may spread when the blood and bodily fluids of an infected person come into contact with broken skin or mucous membranes of an unifected person. The HIV-2 Antibodies test is used to differentiate between HIV-1 and HIV-2 infections. Abnormal results may require further evaluation by your physician.