AIDS STANDS FOR ' Acquired immunodeficiency Syndrome 'which means having a defective immune system .AIDS is caused by human immunodeficiency virus(HIV) which is transmitted during blood transfusion or sexual relation.Inside the body ,the virus attaches itself to specific white blood cells ,which are important for the body's immune system .Subsequently the virus penetrate these cells,destroys them ,and produces new HIV viruses .If uncontrolled , the virus slowly destroys the entire immune system of the body.Even minor illness like the common cold can assume serious proportions .There are medicines can slow down the onset of AIDS ,but none to completely cure it. VACCINATION -Vaccination protect us against life threatening infectious diseases .It is the injection of weakened or dead