The HIVs in the blood of a HIV-positive person attack the white blood cells (lymphocytes). Theviruses reproduce and increase in number within the lymphocytes. Then the lymphocytes burstand release more viruses in the bloodstream.
The released viruses attack more, new white cells.The attack continues in that cycle until many white cells are destroyed. Because there are only afew white cells left to fight against pathogens, the body immunity gets low. Once the immunityis lowered, the body is often attacked by diseases and a person suffers from AIDS.