The Importance of Immunizations
Immunization is key to preventing disease among the general population. Vaccines benefit both the people who receive them, and the vulnerable, unvaccinated people around them, because the infection can no longer spread. In addition, immunizations reduce the number of deaths and disability from infections, such as whooping cough and chickenpox.
Although children receive the majority of the vaccinations, adults also need to stay up-to-date on certain vaccinations, including tetanus and diphtheria. In addition, those adults who have never had chickenpox or measles during childhood (nor the vaccines against these specific diseases) should consider being vaccinated. Childhood illnesses such as mumps, measles, and chickenpox can cause serious complications in adults.
CDC's Recommended Immunization Schedule 2010