Vaccine preventable diseases (VPDs) are conditions which are preventable through vaccines available to protect against these diseases. Vaccines are counted among the greatest public health achievements of the twentieth century. Countless lives have been saved and many diseases have been prevented because of vaccines. Today, vaccine preventable disease levels are at record lows. Even though most infants and toddlers have received all recommended vaccines by age 2, many under-immunized children remain, leaving the potential for outbreaks of disease. Many adolescents and adults are under-immunized as well, missing opportunities to protect themselves against diseases such as Hepatitis B, influenza, and pneumococcal disease. Be wise, immunize and protect yourself and your loved one.