The change in the blood from HIV antibody negative to HIV antibody positive, meaning HIV has been acquired. Seroconversion causes an immune system’s response to the presence of HIV antigens in the blood and occurs shortly after HIV has transmitted. HIV seroconversion may be asymptomatic but it is often accompanied by a ‘seroconversion illness’. Typical symptoms of seroconversion include fever, myalgia, swollen lymph glands, sore throat and rash. These symptoms usually resolve within one to three weeks, when antibody production is complete in response to HIV.