In fact, HIV infection, whose causes and transmission ways are known, and whose prevention is known and practical, is not a devastating disease, and does not cause death and harms quickly after infection; and ultimately, there are effective medications for disease control that can suppress the virus and the disease, prevent many opportunistic infections, provide near-normal life span for the infected person, and ultimately prevent the transmission of the virus to others.
The treatment should be started as soon as a person gets a positive test result.
If a healthcare professional has confirmed that someone living with HIV has an undetectable viral load (meaning effective treatment has reduced the amount of virus in their blood so that it cannot be detected through a blood test) there is no risk of transmission. Undetectable = Untransmissable (U+U).
The important thing to remember is that taking treatment means you can live a long and healthy life like anyone else.