HIV infection has been curable for a long time. As long as the treatment is given within the first 24 hours of infection, they can break the reproductive cycle of the virus. This is why many places have passed “good samaritan” laws which compel anyone who bites an emergency responder (cop, paramedic, firefighter) to get a test for HIV. The treatment to cure HIV is 100% effective, but has some very serious side effects. A person might be HIV-positive and not test positive, which means a negative test still leaves the person bitten in a quandary, but a positive test removes all doubt.
There is also some evidence that HIV is becoming friendlier. The common flu we get now is the same flu which killed 120 million people at the turn of the 20th century. The reason it doesn’t kill anyone but the very old, very young, and immune-impaired is because diseases which kill their host have a harder time spreading than diseases which don’t. The less lethal strains of Spanish Flu outperformed the more lethal ones, eventually driving them out of existence. In Africa, where HIV ran rampant, strains which killed their hosts fast quickly dropped out of the race, leaving only ever less lethal variants to spread. In time, HIV will be nothing more than another cold or flu.