HIV stands for Human Immunodeficiency Virus which attacks the body's immune system. Currently there is no cure and once someone is infected they will have it for life. There are a number of symptoms one might experience, however it is best to get tested.
Causes
HIV is transmitted by contact with body fluids, including semen and blood. HIV can be spread if these fluids come in contact with an open wound, mucous membrane, or damaged tissue. HIV cannot spread through sweat, saliva, or urine.
The safest way to prevent getting any STI is abstinence, however, if that is not an option, then you can lower your risk by wearing a condom and not sharing any type of needles with other people. There are also some medications which one could take if prescribed.
Treatment
HIV cannot be cured, so once someone has been infected, they will have the virus for life. You can get the virus under control, and the CDC says that if you are able to lower your HIV to an undetectable viral load, you will not transmit HIV to your partner.
Your healthcare provider will most likely prescribe metronidazole, however, they might also prescribe tinidazole. Women are usually prescribed metronidazole for seven days, and men are prescribed a single dose of the same medication.
Unless both you and your partner are treated, you will pass it back and forth. Having intercourse within one week after treatment may be too soon and increase the risk of reinfection. You should return to your healthcare provider 3 months later to ensure you do not have the infection anymore.