<Ul> <Li> Primary HIV infection: May be either asymptomatic or associated with acute retroviral syndrome . </Li> <Li> Stage I: HIV infection is asymptomatic with a CD4 T cell count (also known as CD4 count) greater than 500 per microlitre (μl or cubic mm) of blood . May include generalized lymph node enlargement . </Li> <Li> Stage II: Mild symptoms which may include minor mucocutaneous manifestations and recurrent upper respiratory tract infections . A CD4 count of less than 500 / μl . </Li> <Li> Stage III: Advanced symptoms which may include unexplained chronic diarrhea for longer than a month, severe bacterial infections including tuberculosis of the lung, and a CD4 count of less than 350 / μl . </Li> <Li> Stage IV or AIDS: severe symptoms which include toxoplasmosis of the brain, candidiasis of the esophagus, trachea, bronchi or lungs and Kaposi's sarcoma . A CD4 count of less than 200 / μl . </Li> </Ul> <Li> Primary HIV infection: May be either asymptomatic or associated with acute retroviral syndrome . </Li> <Li> Stage I: HIV infection is asymptomatic with a CD4 T cell count (also known as CD4 count) greater than 500 per microlitre (μl or cubic mm) of blood . May include generalized lymph node enlargement . </Li> <Li> Stage II: Mild symptoms which may include minor mucocutaneous manifestations and recurrent upper respiratory tract infections . A CD4 count of less than 500 / μl . </Li>

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