Facts about HIV
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stands for human immunodeficiency virus. This is the virus
that causes AIDS. HIV is different from most other viruses because
it attacks the immune system. The immune system gives our bodies the
ability to fight infections.
finds and destroys a type of white blood cell (T cells or CD4 cells)
that the immune system must have to fight disease.
AIDS stands for acquired immunodeficiency syndrome.
AIDS is the final stage of HIV infection. It can take years for a
person infected with HIV, even without treatment, to reach this stage.
Having AIDS means that the virus has weakened the immune system to
the point at which the body has a difficult time fighting infections.
When someone has one or more of these infections and a low number
of T cells, he or she has AIDS.
Origin of HIV
Scientists identified a type of chimpanzee in West Africa as the source
of HIV infection in humans. The virus most likely jumped to humans
when humans hunted these chimpanzees for meat and came into contact
with their infected blood. Over several years, the virus slowly spread
across Africa and later into other parts of the world.
Brief History of HIV in the United States
HIV was first identified in the United States in 1981 after a number
of gay men started getting sick with a rare type of cancer. It took
several years for scientists to develop a test for the virus, to understand
how HIV was transmitted between humans, and to determine what people
could do to protect themselves. During the early 1980s, as many as
150,000 people became infected with HIV each year. By the early 1990s,
this rate had dropped to about 40,000 each year, where it remains
AIDS cases began to fall dramatically in 1996, when new drugs became
available. Today, more people than ever before are living with HIV/AIDS.
CDC estimates that about 1 million people in the United States are
living with HIV or AIDS. About one quarter of these people do not
know that they are infected: not knowing puts them and others at risk.
How HIV Is and Is Not Transmitted
HIV is a fragile virus. It cannot live for very long outside the
body. As a result, the virus is not transmitted through day-to-day
activities such as shaking hands, hugging, or a casual kiss. You cannot
become infected from a toilet seat, drinking fountain, doorknob, dishes,
drinking glasses, food, or pets. You also cannot get HIV from mosquitoes.
HIV is primarily found in the blood, semen, or vaginal fluid of
an infected person. HIV is transmitted in 3 main ways:
- Having sex (anal, vaginal, or oral) with someone infected with
- Sharing needles and syringes with someone infected with HIV
- Being exposed (fetus or infant) to HIV before or during birth
or through breast feeding
HIV also can be transmitted through blood infected with HIV.
However, since 1985, all donated blood in the United States has been
tested for HIV. Therefore, the risk for HIV infection through the
transfusion of blood or blood products is extremely low. The U.S.
blood supply is considered among the safest in the world.
Risk Factors for HIV Transmission
You may be at increased risk for infection if you have:
- injected drugs or steroids, during which equipment (such as needles, syringes, cotton, water) and blood were
shared with others
had unprotected vaginal, anal, or oral sex
(that is, sex without using condoms) with men who have sex with
men, multiple partners, or anonymous partners
exchanged sex for drugs or money
been given a diagnosis of, or been treated
for, hepatitis, tuberculosis (TB), or a sexually transmitted disease
(STD) such as syphilis
received a blood transfusion or clotting
factor during 1978–1985
had unprotected sex with someone who has
any of the risk factors listed above
Your risk of getting HIV or passing it to someone else depends on
several things. Do you know what they are? You might want to talk
to someone who knows about HIV. You can also do the following:
• Abstain from sex (do not have oral, anal, or vaginal sex) until
you are in a relationship with only one person, are having sex with
only each other, and each of you knows the other’s HIV status.
If both you and your partner have HIV, use
condoms to prevent other sexually transmitted diseases (STDs) and
possible infection with a different strain of HIV.
If only one of you has HIV, use a latex
condom and lubricant every time you have sex.
• If you have, or plan to have, more than one sex partner,
consider the following:
Get tested for HIV
If you are a man who has had sex with other men, get tested at least
once a year.
If you are a woman who is planning to get pregnant or who is pregnant,
get tested as soon as possible, before you have your baby.
Talk about HIV and other STDs with each partner
before you have sex.
Learn as much as you can about each partner’s
past behavior (sex and drug use), and consider the risks to your
health before you have sex.
Ask your partners if they have recently
been tested for HIV; encourage those who have not been tested to
Use a latex condom and lubricant every time
you have sex.
If you think you may have been exposed to
another STD such as gonorrhea, syphilis, or Chlamydia trachomatis
infection, get treatment. These diseases can increase your risk
of getting HIV.
Get vaccinated against hepatitis B virus.
Even if you think you have low risk for HIV
infection, get tested whenever you have a regular medical check-up.
Do not inject illicit drugs (drugs not prescribed
by your doctor). You can get HIV through needles, syringes, and
other works if they are contaminated with the blood of someone who
has HIV. Drugs also cloud your mind, which may result in riskier
If you do inject drugs, do the following:
Use only clean needles, syringes, and other
Never share needles, syringes, or other works.
Be careful not to expose yourself to another
Get tested for HIV test at least once a
Consider getting counseling and treatment
for your drug use.
Get vaccinated against hepatitis A and B
Do not have sex when you are taking drugs
or drinking alcohol because being high can make you more likely
to take risks.
To protect yourself, remember these ABCs:
Symptoms of HIV Infection
The only way to know whether you are infected is to be tested for HIV.
You cannot rely on symptoms alone because many people who are infected
with HIV do not have symptoms for many years. Someone can look and feel
healthy but can still be infected. In fact, one quarter of the HIV-infected
persons in the United States do not know that they are infected.
Once HIV enters the body, the body starts to produce antibodies—substances
the immune system creates after infection. Most HIV tests look for these
antibodies rather than the virus itself. There are many different kinds
of HIV tests, including rapid tests and home test kits. All HIV tests
approved by the US government are very good at finding HIV.
Finding a Testing Site
Many places offer HIV testing: health departments, doctors' offices,
hospitals, and sites specifically set up to provide HIV testing.