Because disease prevention is the key to maintaining public health. It is always better to prevent a disease than to treat it. Vaccines prevent disease in the people who receive them and protect those who come into contact with unvaccinated individuals. Vaccines help prevent Infectious Diseases and save lives.Vaccines are responsible for the control of many Infectious Diseases that were once common killers in the US; including polio, measles, diphtheria, pertussis (whooping cough), rubella (German measles), mumps, tetanus, and Haemophilus influenzae type b (Hib).Vaccine-preventable diseases have a costly impact on society and can also be expensive for the patient and their family. These diseases often result in visits to doctor's offices, severe hospitalizations, and premature deaths. Appr