Scanning electron micrograph of HIV particles infecting a human H9 T cell, colorized in blue, turqoise, and yellow.

HIV and AIDS

HIV (human immunodeficiency virus) is a virus that attacks the immune system. If untreated, HIV can progress to AIDS (acquired immunodeficiency syndrome), the most advanced stage of the infection.

Quick Facts

  • HIV is a manageable chronic condition with modern treatment
  • AIDS is the advanced stage of untreated or poorly controlled HIV
  • HIV is transmitted through specific body fluids, not casual contact
  • Early diagnosis and treatment can prevent progression to AIDS
  • People with well-controlled HIV can live long, healthy lives

Symptoms

  • Symptoms vary by stage and may not appear immediately. Early HIV symptoms may include:
    • Fever or chills
    • Fatigue
    • Swollen lymph nodes
    • Sore throat or rash
    Later-stage symptoms (advanced HIV or AIDS) may include:
    • Persistent infections
    • Unexplained weight loss
    • Night sweats
    • Chronic diarrhea
    • Neurologic or cognitive change
  • Causes

    HIV is caused by infection with the human immunodeficiency virus, which weakens the immune system by attacking CD4 cells. Without treatment, ongoing immune damage can lead to AIDS.

    HIV is transmitted through:

    • Unprotected sexual contact
    • Sharing needles or injection equipment
    • Blood exposure
    • Transmission from parent to child during pregnancy, birth, or breastfeeding

    Risk Factors

    People at higher risk for HIV include those who:

    • Have unprotected sex
    • Share needles or injection equipment
    • Have multiple sexual partners
    • Have a partner with HIV who is not virally suppressed
    • Have limited access to preventive care or testing

    Treatments

    There is no cure for HIV, but effective treatment allows most people to live normal lives. Treatment options include:

    • Antiretroviral therapy (ART) to control viral replication
    • Regular monitoring of viral load and immune function
    • Preventive care for opportunistic infections
    • Ongoing primary and specialty care coordination

    Early and consistent treatment can prevent progression to AIDS.

    When to Seek Care

    See a doctor if you believe you may have been exposed to HIV, experience persistent flu-like symptoms, or have not been tested and are at increased risk. Early testing and treatment are critical.

    Medical Disclaimer: This content is for general educational purposes only and does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your symptoms or health concerns. If you are experiencing a medical emergency, call 911 or seek immediate care
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