The purpose of immunization is to protect the individual and the community against diseases that can be prevented by vaccination. Although the vaccines used are very reliable in terms of effectiveness and their side effects are minimal, in general, no vaccine is free of side effects. People who receive the vaccine may experience mild side effects or, in rare cases, severe and even life-threatening side effects. These reactions are sometimes the result of the effects of the vaccine itself, and in others are due to errors in how the vaccine is stored or administered. Whatever the reason,...