The very first thing that a medical practitioner-physician, surgeon, neurologist or one of any branch of medicine, for that purpose-looks at his charge is the element of Immunology-from the very common cold, cough, sore throat, fever right upto the dreadedmost of all-cancer-for developing defense against the invading forces. The first line of treatment is to make the living body immune to the attackers-moulds, fungi, bacteria, viruses, food and drink and a host of them. Of course, literature has hitherto been presented and shall be presented in times to come. Yet this presentation is unique as it imparts information to anyone who seeks to educate the self. It is most useful at all levels, especially to students of Microbiology, Biochemistry, Biotechnology, Medicine and Allied Life Sciences-budding Scientists of the morrow to come. Right from the beginning, it delves into matters of IMMUNE SYSTEM; HARMFUL CONSEQUENCES OF IMMUNODEFICIENCY; ASSOCIATED DISEASES; TUMOURS; GRAFT; REJECTION;.