Background The year 1981 will never be forgotten for the human health tragedy which was revealed in some peculiar infections caused by the immunodeficiency syndrome. These infections were observed initially in homosexual males in the USA and later in other parts of the world. This gay-related immunodeficiency syndrome (GRIDS) was subsequently named AIDS by the Centre for Disease Control and Prevention, USA. The biomedical scientists’ curiosity and ingenuity soon succeeded in identifying the v...