Per CDC:
Key points
HIV is a virus that attacks the body's immune system.
The only way to know if you have HIV is to get tested.
There are many ways to prevent HIV, like using PrEP, PEP, condoms and never sharing needles.
HIV treatment helps people live long, healthy lives and prevents HIV transmission.
Symptoms
Most people have flu-like symptoms within 2 to 4 weeks after infection. Symptoms may last for a few days or several weeks.
Having these symptoms alone doesn't mean you have HIV. Other illnesses can cause similar symptoms.
Some people have no symptoms at all. The only way to know if you have HIV is to get tested.
Prevention
Today, more tools than ever are available to prevent HIV.
Prevention strategies include:
If you have HIV, there are many ways to prevent transmitting HIV to others, including taking HIV treatment to get and keep an undetectable viral load.
To learn more please visit: About HIV | HIV | CDC