Remember that vaccines used in this country are incredibly safe. There is no increased risk of side effects in an otherwise healthy child. In fact, when children come to this country from overseas, and the shot record cannot be found, the official recommendation of the CDC (Centers for Disease Control) is to start the series over again. The major drawback for the patient is the discomfort of getting the extra injections.
Parents should maintain some sort of immunization booklet for their children, so that this information can be shared to a new provider when families move. Currently, in some communities, a computerized immunization record has been developed that can be viewed by schools and health care providers in that community in order to verify immunization doses and dates.