Acquired Immune Defiency Syndrome(AIDS) is a well known deadly viral disease caused by Human Immunodefiency virus(HIV).
This disease was basically discovered 37 years ago in homosexual teenagers and then in non homosexual person whose exchange blood with others.Up to the present 3 crore 20 lack people were effected by it.No doubt it is most challenging disease but now modern medical sciences has revealed that HIV positive people can live normally.
And in near future its proper treatment will be available in all over the world