| http://www.w3.org/ns/prov#value | - When a person has been infected with HIV for a long time, the number of CD4 cells they have goes down, resulting in acquired immune deficiency syndrome (AIDS), in which the person's immune system no longer functions effectively.The World Health Organization (WHO) has divided the disease into four stages as it progresses, according to symptoms including weight loss and so-called opportunistic infec
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