DTP (Diphtheria, Tetanus, Pertussis) vaccine is administered intramuscularly to immunize children against (d) Whooping cough, also known as pertussis. Alongside protection from whooping cough, the DTP vaccine also guards against diphtheria, a bacterial infection causing severe respiratory symptoms, and tetanus, a potentially fatal disease characterized by muscle stiffness and spasms caused by bacterial toxins. Immunization with the DTP vaccine is crucial for preventing these serious infectious diseases in children, reducing morbidity and mortality rates, and promoting overall public health by minimizing the spread of these pathogens within communities.