Definitions:
                    HIV: Humen Immuno-deficiency Virus.
                    AIDS:Acquired Immune Deficiency Syndrome.

                   HIV:
                    A virus is very small , disease-causing organism
                    seen throught an election microscope.HIV is a virus ,  
                    which destroys the immune system of the body making it  
                    vulnerable to common and uncommon illnesses.

                   Types of HIV
                      There are two types of HIV-HIV-1&HIV-2.
                      Most of the people in India are infected with HIV-1.
                      HIV-2 infection is less common and the disease progresses 
                      slowly that patient is asymptomatic for along period.
                      HIV-2 is seen mostly in West Africa but also in India,Sri Lanka.

                    Difference between HIV&aids:
                        HIV is the virus that causes the condition AIDS.

                    Immunity:
                        Immunity is the ability or capacity of the body to fight against
                        germs that enter the body.

                    Immune deficiency:
                         The condition where a person's immune system cannot
                          protect the body resulting in an increased susceptibility to
                          various infections and cancers.

                    AIDS:
                          Acquired means not from birth.It is caused by
                          the destruction of body's immune system.
                          Syndrome means a collection of symptoms of many
                          diseases.
                           It takes an average of 8 to 12 years from the entry of the 
                           virus to reach the stage of AIDS.