https://www.afao.org.au/about-hiv/hiv-and-the-law/

In some states you are legally required to disclose your HIV status to sexual partners.

Other situations where disclosure may come into play are outlined below.

The law states that HIV-positive people cannot donate blood, semen, ova or any other body tissues, so application forms given to potential donors may ask about HIV status.
The Department of Immigration and Border Protection requires anyone applying for permanent residency and some other types of visas to provide the results of an HIV test.
You may be asked about your HIV status if applying for life insurance or by your superannuation fund. Some companies may refuse to insure you if you are HIV positive or if you refuse to tell them your status. There may be similar requirements for other types of insurance, such as travel insurance.
People working in healthcare are required to disclose their HIV status if they will be performing exposure-prone procedures.
People applying to work in the defence forces are required to test for HIV.

There are laws across Australia which can be used to charge an individual with recklessly, negligently or deliberately exposing someone or transmitting HIV to another person.  In Australia, state and territories have the authority enact and enforce criminal laws. Some jurisdictions have specific offences relating to transmission, while in others HIV-positive people have been charged with offences such as causing ‘grievous bodily harm’.

AFAO has long advocated against the criminal prosecution of people with HIV. Prosecutions relating to sexual transmission of HIV undermine public health efforts and stigmatise people living with HIV as dangerous and harmful. This has the effect of discouraging key populations from accessing testing and engaging with the health system.

The South Australian, Western Australian and Northern Territory governments have introduced laws that allow for the forced testing for blood borne viruses (BBVs) of individuals accused of certain offences.

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http://www.latimes.com/politics/la-pol-sac-aids-felony-20170315-story.html

Having unprotected sex without telling partner about HIV-positive status no longer would be a felony under new bill

In a test of shifting attitudes about HIV, a group of state lawmakers has proposed that it no longer be a felony for someone to knowingly expose others to the disease by engaging in unprotected sex and not telling the partner about the infection.

The measure by state Sen. Scott Wiener (D-San Francisco) and others would make such acts a misdemeanor, a proposal that has sparked opposition from Republican lawmakers.