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Frequently Asked Questions


What is AIDS? What causes AIDS?

AIDS stands for Acquired Immune Deficiency Syndrome.

An HIV-positive person receives an AIDS diagnosis after developing one of the CDC-defined AIDS indicator illnesses. An HIV-positive person can also receive an AIDS diagnosis on the basis of certain blood tests (CD4 counts) and may not have experienced any serious illnesses. A positive HIV test does not mean that a person has AIDS. A diagnosis of AIDS is made by a physician according to the CDC AIDS Case Definition.

Over time, infection with HIV (Human Immunodeficiency Virus) can weaken the immune system to the point that the system has difficulty fighting off certain infections. These types of infections are known as opportunistic infections. Many of the infections that cause problems or that can be life-threatening for people with AIDS are usually controlled by a healthy immune system. The immune system of a person with AIDS has weakened to the point that medical intervention may be necessary to prevent or treat serious illness.

How long does it take for HIV to cause AIDS?

Currently, the average time between HIV infection and the appearance of signs that could lead to an AIDS diagnosis is 8-11 years. This time varies greatly from person to person and can depend on many factors including a person's health status and behaviors. Today there are medical treatments that can slow down the rate at which HIV weakens the immune system. There are other treatments that can prevent or cure some of the illnesses associated with AIDS. As with other diseases, early detection offers more options for treatment and preventative health care.

How can I tell if I'm infected with HIV? What are the symptoms of AIDS?

The only way to determine whether you are infected is to be tested for HIV. You can't rely on symptoms to know whether or not you are infected with HIV. Many people who are infected with HIV don't have any symptoms for many years.

Similarly, you can't rely on symptoms to identify a person with an AIDS diagnosis. The symptoms associated with AIDS are similar to the symptoms of many other diseases. AIDS is a diagnosis made by a doctor based on specific criteria established by the Centers for Disease Control and Prevention (CDC).

How long after a possible exposure should I wait to get tested for HIV?

The tests commonly used to determine HIV infection actually look for antibodies produced by the body to fight HIV. According to the Centers for Disease Control and Prevention (CDC), most people will develop detectable antibodies within 3 months after infection. Therefore, the CDC recommends testing at 3 months after the last possible exposure (unprotected vaginal, anal or oral sex or sharing needles).

If I test HIV negative does that mean that my partner is HIV negative also?
No. Your HIV test result reveals only your HIV status. Your negative test result does not tell you about the HIV status of your partner(s). HIV is not necessarily transmitted every time there is an exposure. 

What if I test HIV positive?

If you test positive, the sooner you take steps to protect your health, the better. Early medical treatment, a healthy lifestyle and a positive attitude can help you stay well. Prompt medical care may delay the onset of AIDS and prevent some life-threatening conditions. It is important to know that a positive HIV test should always be confirmed, to be sure that it is a true positive. If your test result is positive, there are a number of important steps you can take immediately to protect your health:

See a doctor, even if you don't feel sick. Try to find a doctor who has experience treating HIV. There are now many new drugs to treat HIV infection. There are important tests, immunizations and drug treatments that can help you maintain good health. It is never too early to start thinking about treatment possibilities.
Have a tuberculosis (TB) test done. You may be infected with TB and not know it. Undetected TB can cause serious illness. TB can be treated successfully if detected early. Recreational drugs, alcoholic beverages and smoking can weaken your immune system. There are programs available to help you stop. Consider joining a support group for people with HIV infection or finding out about other resources available in your area, such as HIV/AIDS-knowledgeable counselors for one on one therapy.

I'm HIV positive. Where can I go for information about treatments?

The CDC National AIDS Hotline can offer practical information on maintaining health and general information about a wide variety of treatments, including antiretrovirals and prophylaxis for opportunistic infections. The hotline numbers are 1-800-232-4636 (English and Spanish), or 1-800-232-6348 (TTY). The National AIDS Hotline can also provide referrals to national treatment hotlines, local AIDS Service Organizations and HIV/AIDS-knowledgeable physicians. 

How safe is the U.S. blood supply?

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 it became possible to test donated blood for HIV.
The Public Health Service has recommended a multifaceted approach to blood safety in the United States that includes stringent donor selection practices and the use of screening tests. Blood donations in the United States have been screened for antibody to HIV-1 since March 1985 and HIV-2 since June 1992. Blood and blood products that test positive for HIV are safely discarded and are not used for transfusion

Where did HIV come from?

Scientists have different theories as to the origin of HIV but none have been proven. We now know that the virus has existed in the United States, Haiti and Africa since at least 1977-1978. In 1979 rare types of pneumonia, cancer and other illnesses were being reported by doctors in Los Angeles and New York. The common thread was that these were conditions not usually found in persons with healthy immune systems.

In 1982 the Centers for Disease Control and Prevention (CDC) officially named the condition AIDS (Acquired Immune Deficiency Syndrome). In 1984 the virus responsible for weakening the immune system was identified as HIV (Human Immunodeficiency Virus).

Can a woman give HIV to a man during vaginal intercourse?

Yes. If the woman is infected, HIV is present in vaginal and cervical secretions and can enter the penis through the urethra or through cuts or abrasions on the skin of the penis. The presence of other STDs can increase the risk of transmission. The correct and consistent use of a latex condom or female condom can reduce the risk of transmitting HIV during vaginal intercourse.

Can I get HIV from oral sex?

What is currently known is that there is some risk associated with performing oral sex without protection. Cumulative evidence indicates that the risk is significantly less than that of unprotected anal or vaginal sex.

Currently, risk reduction options when performing oral sex on a man include the use of latex condoms, but also include withdrawal before ejaculation without a condom (avoiding semen in the mouth) and/or refraining from this activity when cuts or sores are present in the mouth.

When performing oral sex on a woman moisture barriers such as a dental dam, a cut-open and flattened condom or household plastic wrap can reduce the risk of exposure to vaginal secretions.

The risk from receiving oral sex, for both a man and a woman, is considered to be very low, and there have been no documented cases of transmission through receiving oral sex.

How effective are latex condoms in preventing HIV?

Several studies have demonstrated that latex condoms are highly effective in preventing HIV transmission when used correctly and consistently. These studies looked at uninfected people considered to be at very high risk of infection because they were involved in sexual relationships with HIV-infected persons. The studies found that even with repeated sexual contact, 98-100% of those people who used latex condoms consistently and correctly remained uninfected.

What's the connection between HIV and other sexually transmitted diseases?

Having a sexually transmitted disease (STD) can increase a person's risk of becoming infected with HIV, whether or not that STD causes lesions or breaks in the skin. If the STD infection causes irritation of the skin, breaks or sores may make it easier for HIV to enter the body during sexual contact. Even an STD that causes no breaks or sores can stimulate an immune response in the genital area that can make HIV transmission more likely.

Can I get HIV from kissing?

Casual contact through closed-mouth or "social" kissing is not a risk for transmission of HIV. Because of the potential for contact with blood during "French" or open-mouth, wet kissing, CDC recommends against engaging in this activity with a person known to be infected. However, the risk of acquiring HIV during open-mouth kissing is believed to be very low. CDC has investigated only one case of HIV infection that may be attributed to contact with blood during open-mouth kissing. In this case both partners had extensive dental problems including gingivitis (inflammation of the gums). It is likely that there was blood present in both partners' mouths making direct blood to blood contact a possibility.

Should I be concerned about getting infected with HIV while playing sports?

There are no documented cases of HIV infection acquired through participation in sports. The very low risk of HIV transmission through sports participation would principally involve sports with direct body contact where bleeding may be expected to occur. In the event of injury during such sports, sports participation should be interrupted until the wound stops bleeding and is both antiseptically cleaned and securely bandaged. There is no risk of transmission through sports activities where bleeding does not occur.

Can I get HIV from casual contact (shaking hands, hugging, using a toilet, drinking from the same glass, or the sneezing and coughing of an infected person)?

No. HIV is not transmitted by day to day contact in the home, the workplace, schools, or social settings. HIV is not transmitted through shaking hands, hugging or a casual kiss. You cannot become infected from a toilet seat, a drinking fountain, a doorknob, dishes, drinking glasses, food, or pets.

HIV is a fragile virus that does not live long outside the body. HIV is not an airborne or foodborne virus. HIV is present in the blood, semen or vaginal secretions of an infected person and can be transmitted through unprotected vaginal, oral or anal sex or through sharing injection drug needles.

Can I get infected with HIV from mosquitoes?

No. From the onset of the HIV epidemic, there has been concern about transmission of the virus by biting and bloodsucking insects. However, studies conducted by CDC and elsewhere have shown no evidence of HIV transmission through insects-- even in areas where there are many cases of AIDS and large populations of insects such as mosquitoes. Lack of such outbreaks, despite intense efforts to detect them, supports the conclusion that HIV is not transmitted by insects.

What are CDC's recommendations for prevention of transmission of HIV through injecting drug use?

For injecting drug users who can not stop using drugs, the best way to minimize the risk of transmission of HIV and other diseases is to never re-use or "share" syringes, water or drug preparation equipment. Keep in mind the following points:

Use only syringes obtained from a safe, reliable source (a pharmacy or syringe exchange).

Use a new, sterile syringe to prepare drugs.

If possible, use sterile water to prepare drugs; otherwise use clean water from a reliable source (fresh tap water).

Use a new or disinfected container ("cooker") and a new filter ("cotton") to prepare drugs.

Clean the injection site prior to injection with a new alcohol swab.

Safely dispose of syringes after one use.

The availability of new, sterile syringes varies, depending on state and local regulations regarding the sale and possession of syringes, and on other factors, such as the existence of syringe exchange programs sponsored by local HIV prevention organizations.

What about recommendations for cleaning needles and syringes?

If new, sterile syringes and other drug preparation equipment are not available, then previously used equipment should be disinfected with bleach using the following procedures. Disinfecting previously used needles and syringes with bleach can reduce the risk of HIV transmission but is not as safe as always using a new, sterile needle and syringe.

Flush the needle and syringe several times with clean water, being sure the needle is completely submersed.

Then, fill the syringe to the top several times with full-strength liquid chlorine bleach. Filling the syringe with bleach at least 3 times and allowing the bleach to remain in the syringe for at least 30 seconds may increase the likelihood that HIV will be inactivated.

To rinse, flush the needle and syringe again several times with clean water. Do not reuse the pre-bleach wash water for this step.

These procedures should be performed twice: once immediately after use and again just before reuse. Shaking and tapping the syringe are recommended when the syringe is filled with water and bleach. This should improve the effectiveness of all steps.