This document discusses immunization and communicable diseases. It defines vaccination as a method of stimulating the immune response through active immunization. It outlines different types of vaccines including live, attenuated, inactivated, toxoids, and polysaccharide/polypeptide vaccines. Common side effects and nursing management are described for various vaccines. Communicable diseases are defined as illnesses transmitted directly or indirectly between humans, animals, or the environment. Common communicable diseases like the common cold and influenza are explained along with their symptoms, diagnosis, and treatment.