Epidemiology, natural history and prevention; human immunodeficiency virus; host response; classification and spectrum; cutaneous manifestations; ophthalmic manifestations; oral cavity manifestations; pulmonary complications; gastrointestinal manifestations; neurologic manifestations; metabolic manifestations; haemologic manifestations; microbiology of opportunistic infections; clinical manifestations of opportunistic infections; treatment and prophylaxis of opportunistic infections; AIDS-associated malignancies; antiviral treatments; paediatric HIV infection; HIV infection in women.