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Dear Student, Such questions are made for enhancing the self creative skills and should be tried answering on your own. However, here are a few points that will help you in framing your answer: 1. Vaccine can contain either live attenuated(weakned) or killed micro-organisms. These micro-organisms activate immune system of human body that can easily kill them. Now, the immune system knows how to kill this organism. So, if the same active organism attacks again, then immune system can fight against it and protect human body. 2. Some Vaccines that have been produced are against Tuberculosis (BCG vaccine), Tetanus, Diphtheria, Hepatitis B, Human Influenza, Pertussis (Pentavalent vaccine), Yellow Fever, Japanese Encephalitis. These vaccines are also given in National Immunization Schedule of India. You may feel free to contact us if you face any issue or difficulty while composing your answer. You can also send us your answers here for feedback and required corrections, if any. Regards