infections
Human Immunodeficiency Virus (HIV) Infection
Acquired immunodeficiency syndrome (AIDS)
AIDS is the most severe form of HIV infection. HIV infection is considered to be AIDS when at least one serious complicating illness develops or the number (count) of CD4+ lymphocytes decreases substantially. When people who are infected with HIV develop certain illnesses, AIDS is diagnosed. These illnesses, called AIDS-defining illnesses, include Serious infections that occur mainly in people with a weakened immune system (called opportunistic infections), including fungal infections (such as Cryptococcosis and Certain cancers, such as invasive Cervical Cancer , Dysfunction of the nervous system A substantial loss of weight due to HIV infection (AIDS wasting) 