Under investigation - A case which has been notified but information is not yet available to classify it as confirmed.

Confirmed - HIV infection with an AIDS-defining condition (see below).

Not a case - A case that has been investigated and subsequently found not to meet the case definition.

AIDS-defining conditions
For surveillance purposes, a person with HIV infection is said to have developed AIDS when one or more of the following list of AIDS-defining conditions first develop:

• Candidiasis of bronchi, trachea or lungs
• Candidiasis, oesophageal
• Cervical cancer, invasive
• Coccidioidomycosis, disseminated or extrapulmonary
• Cryptococcosis, extrapulmonary
• Cryptosporidiosis, chronic intestinal (>1 month duration)
• Cytomegalovirus disease (other than liver, spleen or nodes)
• Cytomegalovirus retinitis (with impairment of vision)
• Herpes simplex: chronic ulcer(s) (>1 month duration), bronchitis, pneumonitis or oesophagitis
• Histoplasmosis, disseminated or extrapulmonary
• HIV-related encephalopathy
• HIV-related wasting
• Isosporiasis, chronic intestinal (>1 month duration)
• Kaposi’s sarcoma
• Lymphoma, Burkitt’s (or equivalent term)
• Lymphoma, immunoblastic (or equivalent term)
• Lymphoma, primary, of brain
• Mycobacterium avium complex or M. kansasii infection, disseminated or extrapulmonary
• Mycobacterium tuberculosis infection, any site (pulmonary or extrapulmonary)
• Mycobacterium, other species or unidentified species, infection, disseminated or extrapulmonary
• Pneumocystis jiroveci pneumonia
• Pneumonia, recurrent
• Progressive multifocal leukoencephalopathy
• Salmonella septicaemia, recurrent
• Toxoplasmosis of brain.

For children, additional conditions are:

• Serious multiple or recurrent bacterial infections, that is, at least two culture confirmed infections (septicaemia, pneumonia, meningitis, bone or joint infection, or abscess of an internal organ or body cavity) within a two-year period.

More detailed information is available from https://www.otago.ac.nz/aidsepigroup/index.html