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HIV/AIDS

Definition

Human immunodeficiency virus (HIV) causes HIV infection and AIDS. The virus attacks the immune system. As the immune system weakens, the body is at risk of getting life-threatening infections and cancers. Once a person has the virus, it stays inside the body for life.

Alternative Names

HIV infection; Infection - HIV; Human immunodeficiency virus; Acquired immune deficiency syndrome

Causes

The virus is spread (transmitted) person-to-person in any of the following ways:

The virus is NOT spread by:

HIV and blood or organ donation:

People at high risk of getting HIV include:

After HIV infects the body, the virus has been found in many different fluids and tissues in the body.

Symptoms

Symptoms related to acute HIV infection (when a person is first infected) are often flu-like. They include:

Many people have no symptoms when they are diagnosed with HIV.

Acute HIV infection progresses over a few weeks to months to become an asymptomatic HIV infection (no symptoms). This stage can last 10 years or longer. During this period, the person can still spread the virus to others.

If they are not treated, almost all people infected with HIV will develop AIDS. A small group of patients with HIV develop AIDS very slowly or never. These patients are called nonprogressors. Many seem to have genes that prevent the virus from causing major damage to their immune system.

People with AIDS have had their immune system damaged by HIV. They are at very high risk of getting infections that are uncommon in people with a healthy immune system. These infections are called opportunistic infections.

Common symptoms are:

Exams and Tests

The HIV ELISA and HIV Western blot tests detect antibodies to the HIV virus in the blood.

A complete blood count (CBC) and white blood cell differential may also show abnormalities.

People with AIDS usually have regular blood tests to check their CD4 cell count:

Other tests that may be done include:

Treatment

There is no cure for HIV infection at this time. But treatments are available to manage symptoms and reduce how much the virus copies itself (replicates). Treatment can also improve the quality and length of life for those who have already developed symptoms.

Antiretroviral therapy suppresses the replication of the HIV virus in the body. A combination of antiretroviral drugs, called antiretroviral therapy (ART) or highly active antiretroviral therapy (HAART), is very effective in reducing the amount of HIV in the bloodstream. This effect is measured by the viral load (how much free virus is found in the blood). Preventing the virus from reproducing (replicating) can improve T-cell counts and help the immune system recover from HIV infection.

People on ART with suppressed levels of HIV can still transmit the virus to others through sex or by sharing needles. ART can prolong and improve life if the level of HIV remains suppressed and the CD4 count remains high (above 200 cells/mm3).

HIV can become resistant to one combination of ART. This is most true in patients who do not take their medications on schedule every day. Tests can check whether an HIV strain is resistant to a certain drug. This information can help the health care provider find the best drug combination and adjust the drug combination when it starts to fail.

When HIV becomes resistant to ART, other drug combinations must be used to try to suppress the resistant strain of HIV. A variety of new drugs on the market treat drug-resistant HIV.

ART treatment can have complications. Each drug has its own side effects. Common side effects are:

When used for a long time, these drugs increase the risk of heart attack, perhaps by increasing the levels of cholesterol and glucose (sugar) in the blood.

People on ART are monitored by their health care provider for possible side effects. Blood tests measuring CD4 counts and HIV viral load will likely be done every 3 months. The goal is to get the CD4 count close to normal and to suppress the amount of HIV virus in the blood to a level where it cannot be detected.

Medicines may be prescribed to treat problems related to AIDS, such as anemia and low white blood cell count, and to prevent opportunistic infections.

Support Groups

Joining a support group where members share common experiences and problems can often help lower the emotional stress of having a long-term illness.

Outlook (Prognosis)

At this time, there is no cure for AIDS. It is almost always fatal without treatment. In the U.S., most patients survive many years after diagnosis because of treatment with ART. New medicines are being developed.

When a person is infected with HIV, the virus slowly begins to destroy that person's immune system. How fast this occurs differs in each person. Treatment with ART can help slow or halt the destruction of the immune system.

Once the immune system is severely damaged, that person has AIDS, and can get infections and cancers that most healthy people would not get. Doctors have found that when CD4 falls below certain counts, specific types of infections and cancers can develop.

When to Contact a Medical Professional

Call for an appointment with your health care provider if you have any risk factors for HIV infection. Also call if you develop symptoms of AIDS. By law, the results of HIV testing must be kept confidential (private). Your health care provider will review your test results with you.

Prevention

Preventing HIV/AIDS:

Safer sex practices, such as using latex condoms, are effective in preventing the spread of HIV. But there is a risk of getting the infection, even with the use of condoms. Abstinence is the only sure way to prevent sexual transmission of HIV.

HIV-positive patients who are taking antiretroviral medicines are less likely to transmit the virus.

The U.S. blood supply is among the safest in the world. Nearly all people infected with HIV through blood transfusions received those transfusions before 1985, the year HIV testing began for all donated blood.

If you believe you have been exposed to HIV, seek medical attention right away. Do not delay. Starting antiviral medicines can reduce the chance that you will be infected. This is called post-exposure prophylaxis (PEP). It has been used to prevent transmission in health care workers injured by needle sticks.

References

Panel on Antiretroviral Guidelines for Adults and Adolescents. Guidelines for the use of antiretroviral agents in HIV-1-infected adults and adolescents. Department of Health and Human Services. Updated May 1, 2014. Accessed May 12, 2014.

Quinn TC. Epidemiology of human immunodeficiency virus infection and acquired immunodeficiency syndrome. In: Goldman L, Schafer AI, eds. Goldman's Cecil Medicine. 24th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 392.

Recommendations for use of antiretroviral drugs in pregnant HIV-1-infected women for maternal health and interventions to reduce prenatal HIV transmission in the United States. Department of Health and Human Services. Updated March 28, 2014. Accessed May 12, 2104.

Sterling TR, Chaisson RE. General clinical manifestations of human immunodeficiency virus infection (including the acute retroviral syndrome and oral, cutaneous, renal, ocular, metabolic, and cardiac diseases). In: Mandell GL, Bennett JE, Dolin R, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 7th ed. Philadelphia, PA: Elsevier Churchill-Livingstone; 2009:chap 121.



Review Date: 5/12/2014
Reviewed By: Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School; Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital, Boston, MA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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