The benefits of immunization Vaccines-which protect against disease by assuring immunity-are widely and routinely given around the world.This practice is based on the idea that it is better to keep people from falling I'll than to focus only on helping them recover once they are illness.Suffering, disaability,and death are avoided. Immunization is thought to prevent two to three million childhood deaths each year. In addition, infection is reduced,strain on health-care systems is eased,and money is frequently saved that can be used for other health services