It would be helpful to have expiration dates for immunizations.  Going into more detail...  When we setup immunizations in Medical Settings it would be very helpful to set how long an immunization is effective.  If an immunization is only good for three years we would set three years in Medical settings.  Then when we enter the immunizations, on the student record, the system would calculate the expiration date.  Then it would be nice to run a report showing students that have expired immunizations.