Know about Human Immunodeficiency Virus

Human immunodeficiency virus (HIV) is a virus that destroys the body's CD4 immune cells, which help fight disease. With the right medications, you can have HIV for years or decades without HIV progressing to AIDS. AIDS (acquired immunodeficiency syndrome) is diagnosed when you have HIV as well as certain opportunistic infections or your CD4 cell count drops below 200.

Everyone with HIV experiences it differently. Some people may develop AIDS within a few months as the virus quickly weakens their immune system. Many others can live for decades with HIV and have a normal life expectancy. You can help prevent HIV from progressing to AIDS by seeing your doctor regularly and following your doctor's recommendations.

Some people don't show any signs of HIV for years after being infected. Many can have some symptoms within 10 days to a few weeks after infection. These first symptoms are similar to the flu or mononucleosis and may include fever, fatigue, rash, and sore throat. They usually disappear after a few weeks and you may not have symptoms again for several years. The only way to tell you have HIV is to get tested.

There is no cure for HIV, but treatment can keep virus levels low and help maintain your immune system. Some drugs interfere with proteins HIV needs to copy itself; others block the virus from entering or inserting its genetic material into your immune cells. Your doctor will consider your general health, the health of your immune system, and the amount of virus in your body to decide when to start treatment.

Due to weakened immune systems, people with HIV can be vulnerable to infections like pneumocystis pneumonia, tuberculosis, candidiasis, cytomegalovirus, and toxoplasmosis. The best way to reduce your risk is to take your HIV medications. Some infections can be prevented with drugs. You can lessen your exposure to some germs by avoiding undercooked meat, litter boxes, and water that may be contaminated.

You can't catch or spread HIV from hugging someone, using the same towel, or sharing the same glass. It's very rare to get HIV from a blood transfusion -- the U.S. blood supply is carefully tested. However, you can spread the disease from having unprotected sex, sharing needles, or getting a tattoo from unsterilized equipment.