Newly acquired HIV infection may be diagnosed in individuals aged 18 months or older at the time of blood sample collection. A diagnosis of newly acquired HIV infection excludes a diagnosis of HIV infection (unspecified).
Reporting
Both confirmed cases and probable cases should be notified.
Confirmed case
A confirmed case requires laboratory definitive evidence only.
Laboratory definitive evidence
- Repeatedly reactive result on a screening test for HIV antibody followed by a positive result on a Western Blot and laboratory evidence of a negative or indeterminate HIV antibody result in the 12 months prior to blood sample collection.
or
- A group IV indeterminate Western Blot and detection of HIV by at least one of the following virologic assays (nucleic acid testing for proviral DNA; HIV p24 antigen, with neutralisation; virus isolation). A group IV indeterminate Western Blot is defined by the presence of a glycoprotein band (gp41, gp120 or gp160) and one or two other HIV specific bands.
Probable case
A probable case requires laboratory suggestive evidence and clinical evidence.
Laboratory suggestive evidence
- Detection of HIV by at least one of the following virologic assays (nucleic acid testing for proviral DNA; HIV p24 antigen, with neutralisation; virus isolation)
or
- Repeatedly reactive result on a screening test for HIV antibody followed by a positive result on a Western Blot.
Clinical evidence
HIV seroconversion illness within the 12 months prior to blood sample collection.
Produced by
Sexual Health and Blood-borne Virus Program