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HIV and AIDS Introduction |
| The primary
cause of AIDS is infection with the
human immunodeficiency virus (HIV).
People infected with
HIV range from those that may
have a positive test for HIV but
exhibit no symptoms for many years
(asymptomatic), to individuals who
have a late stage HIV infection.
Those in the later stages of
infection have progressive HIV
coupled with an AIDS-defining
illness, such as, Pneumocystis
carinii pneumonia or Kaposi's
sarcoma. |
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HIV is a viral
infection that infects CD4
lymphocytes, a type of white
blood cell responsible for
coordinating the functions of the
immune system to fight infection.
HIV reproduces rapidly in the
infected cells and destroys them.
If the HIV infection is left
untreated, the number of CD4
lymphocytes begins to fall, causing
eventual destruction of the immune
system. Diagnosis of AIDS can be
made with a positive HIV test and a
CD4 count of less than 200 cells per
microliter of blood (individual
cases may vary).
HIV is not contagious
and cannot be transmitted by
ordinary human contact. HIV is
carried in body fluids including;
blood, semen, vaginal secretions,
salvia and breast milk. It is
most commonly transmitted by sexual
interaction, sharing or reusing
needles contaminated with the virus,
infected mother to fetus, and from
organ transplants or blood
transfusions. Organs, tissues, and
blood donors are now routinely
screened for HIV.
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HIV Statistics and AIDS Statistics |
According to the
Centers for Disease Control (CDC):
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During 2002, the
cumulative number of AIDS cases
reported to CDC is 886,000.
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During 2002, an
estimated 38 million people are
believed to be infected with HIV
world-wide.
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During 2003, an
estimated 5 million people
acquired AIDS, the greatest number
in any one year since the
beginning of the epidemic.
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During 2003, total
deaths of individuals reported
with AIDS are almost three
million. Over 20 million have died
since the first cases of AIDS were
identified in 1981.
The onset of AIDS
following HIV infection
varies
anywhere between 1 and more than 14
years.
Acute HIV symptoms
commonly appear within 6 weeks of
infection. Persons may first
experience flu-like symptoms and
other signs of infection, including:
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Swollen lymph
glands
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Fever
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Fatigue
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Night sweats
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Rash on the trunk
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Diarrhea
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Joint and muscle
pain
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Sore throat
Symptoms may last
from several days up to two weeks.
After this active phase, an
HIV-infected individual may remain
free of symptoms for years.
However, the virus
may continue to reproduce and
further depress the immune system.
This may lead to the onset of
AIDS. AIDS-defining
illnesses can develop. These
illnesses can include such
opportunistic infections as
Pneumocystis carinii
pneumonia, cancers (Kaposi's
sarcoma), and certain neurological
changes, including dementia and loss
of nerve function..
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Learn More About HIV/AIDS |
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