AIDS, Acquired Immunodificiency Syndrome, is a human viral disease .
            
which destroys the immune system, preventing the body from protecting itself .
            
against infection and disease.  One infected with AIDS becomes vulnerable to .
            
infections harmless in healthy people, but fatal to those with weakened immune .
            
systems.  A cure for AIDS has yet to be found, although drugs that may expand .
            
one's life span and improve one's infection are available.
            
	AIDS is caused by HIV, human immunodificiency virus, however, one .
            
infected with HIV is not always infected with AIDS.  Individuals who have HIV .
            
sometimes do not develop a clinical illness of AIDS for ten years or more.  The .
            
term AIDS is not often used by physicians until the patient has reached the final .
            
stage.
            
	In 1981 in California and New York, AIDS was found in homosexual men .
            
and drug users.  AIDS grew among heterosexual men, women and children in .
            
Sub-Saharan Africa not long after its identification in the United States.  .
            
Approximately thirty-five million adults and two million children were infected .
            
with HIV or AIDS by the year 2000.  From 1981 to 2000, an estimated twenty-.
            
two million people died by the infection of AIDS; more than four million of .
            
those were children fourteen years of age and younger.
            
	AIDS is known as the final stage of HIV.  Two types of this virus have .
            
been found. HIV-1 is the primary cause and HIV-2 is found mostly in West .
            
Africa.  HIV carries a protein structure that binds with a specific structure found .
            
on  the outer surface of cells.  White blood cells of the immune system are .
            
vulnerable to HIV.  When HIV attacks a CD4 cell, a certain T cell, it .
            
commandeers the genetic tools within the cell to produce new HIV virus.  The .
            
new HIV virus destroys the CD4 cell .
            
before leaving the cell completely.
            
	The CD4 cells help other types of immune cells respond to invading .
            
organisms.  Without CD4 cells, one's health would be endangered.  An average .