New HIV classification

The US Centers for Disease Control and Prevention (CDC) revises the way it classifies HIV infection, putting more emphasis on the number of CD4 cells in the immune system. The CDC expands the definition of AIDS to include people living with HIV with a CD4 count of less than 200 (or less than 14% of total lymphocytes). It also adds pulmonary tuberculosis, recurrent pneumonia and invasive cervical cancer to the list of AIDS-defining illnesses.