What is human immunodeficiency virus?

Answer:

HIV (human immunodeficiency virus) is a virus that attacks the immune system, the body's natural defence system. Without a strong immune system, the body has trouble fighting off disease. Both the virus and the infection it causes are called HIV.

More info here
http://www.webmd.com/hiv-aids/tc/human-immunodeficiency-virus-hiv-infection-symptoms

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