Sigmund Freud emphasized the importance of the unconscious mind, and a primary assumption of Freudian theory is that the unconscious mind governs behavior to a greater degree than people suspect.
The only way to tell. The only way to tell if a person has HIV is through the HIV Antibody Test, which detects the presence of antibodies produced by the body in response to the HIV virus. It can take up to three months for antibodies to be developed.
There is no way to know for sure if someone else has HIV unless they have an HIV test. Many people with HIV look perfectly healthy. Other people who are sick with HIV may have symptoms that are identical to other common illnesses. You cannot tell by looking whether someone is HIV positive.