This document discusses vaccines and serums. It introduces vaccines, the diseases they prevent, and types of inoculation. Passive inoculation through breastfeeding provides antibodies from mother's milk that offer temporary protection. Attenuated vaccines use weakened live viruses or bacteria to stimulate immunity. Combining attenuated and killed vaccines provides stronger protection with fewer risks. Young children are most vulnerable so vaccination should begin at birth or within the first 15 months. Vaccines provide better and longer-lasting protection than passive inoculation alone. The first documented use of an attenuated vaccine was Jenner's smallpox vaccine developed from cowpox fluid in 1796.