Vaccine security

As per definition (UNICEF, WHO) vaccine security is the timely, sustained, uninterrupted supply of affordable vaccines of assured quality. Immunization is well recognized as one of the most cost-effectiveness public health measures in prevention and control of severe infectious diseases. Vaccine shortages, even for a short period of time, might increase risk of vaccine preventable diseases (VPDs) to surge and cause morbidity and mortality among vulnerable persons.