Acute HIV infection
The period following infection when there is rapid production of virus. An estimated 80% to 90% of individuals with primary HIV infection develop an acute syndrome (disorder) characterized by flulike symptoms of fever, fatigue, swollen lymph nodes, sore throat, headache, aching muscles, and sometimes skin rash. Following infection, the immune system produces antibody and a cellular response to the virus (seroconversion) and a broad HIV-specific immune response occurs, usually within an average of 3 weeks after HIV infection. High levels of virus (HIV RNA) can be found in the blood during this time.