Immunization information systems (IISs) are confidential, computerized databases that record and consolidate information on all vaccine doses administered byImmunization information systems (IISs) are confidential, computerized databases that record and consolidate information on all vaccine doses administered byImmunization information systems (IISs) are confidential, computerized databases that record and consolidate information on all vaccine doses administered byImmunization information systems (IISs) are confidential, computerized databases that record and consolidate information on all vaccine doses administered byImmunization information systems (IISs) are confidential, computerized databases that record and consolidate information on all vaccine doses administered byImmunization information systems (IISs) are confidential, computerized databases that record and consolidate information on all vaccine doses administered byImmunization information systems (IISs) are confidential, computerized databases that record and consolidate information on all vaccine doses administered by