The document discusses immunization and vaccination. It defines key terms like vaccination, immunization, seroconversion, and seroprotection. It outlines the national immunization schedule from birth through adolescence according to both the universal immunization program and the Indian association of paediatrics. The schedule includes vaccines for diseases like tuberculosis, diphtheria, tetanus, pertussis, polio, hepatitis B, Hib, measles, mumps, rubella, and typhoid. The document also discusses the route of administration for different vaccines and possible adverse effects.