HIV stands for human immunodeficiency virus. It's a virus that attacks the body's immune system, specifically a type of white blood cell called a CD4 cell (also called a T-cell) that helps your body fight off infections.
Over time, if HIV isn't treated, it can weaken the immune system so much that the body has trouble fighting off illnesses it would normally handle easily. But with today's medications, most people with HIV can keep the virus under control, stay healthy, and live a normal lifespan.
How HIV Affects the Body
When HIV enters the body, it copies itself using CD4 cells, which damages and eventually destroys them. As the number of CD4 cells drops, the immune system becomes less able to protect the body from infections and certain illnesses.
This is why HIV care focuses on two main numbers your care team will track:
CD4 count: a measure of how strong your immune system is
Viral load: a measure of how much HIV is in your blood
HIV Is Not the Same as AIDS
HIV and AIDS are related but not the same thing. AIDS (acquired immunodeficiency syndrome) is a specific stage of HIV infection that happens only when the immune system has been severely damaged. Most people diagnosed with HIV today start treatment long before this stage and never develop AIDS.
What a Diagnosis Means Today
An HIV diagnosis is not the emergency it once was. Modern treatment, called antiretroviral therapy (ART), can lower the amount of virus in the blood to an undetectable level. People who reach and maintain an undetectable viral load:
Stay healthier, with immune systems that function normally
Cannot transmit HIV to sexual partners (known as U=U, or Undetectable = Untransmittable)
Can expect a life expectancy close to that of someone without HIV
Key Takeaways
HIV is a virus that targets the immune system's CD4 cells.
Left untreated, HIV can advance to AIDS, but this is preventable with treatment.
Daily treatment can reduce the virus to undetectable levels, protecting your health and preventing transmission to partners.
An HIV diagnosis today is a manageable, chronic condition, not a death sentence.
This guide is intended for general educational purposes. Please talk with your healthcare provider about your specific situation, testing, and treatment options.
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