INTRODUCTION
Vaccines are among the most important tools used to prevent and treat infectious disease.Saving an estimated 3 million lives annually,as well as billions of dollars in treatment costs,they represent both one of mankind's great humanitarian accomplishments and one of our best investments [1,2].Yet,in spite of their well-established track record,misinformation regarding vaccine safety and efficacy stubbornly persists.Decreased rates of immunization in many parts of the world attest to the fact that anti-vaccine campaigns and other sources of misinformation are distorting public perception of these life-saving measures [3].