Welcome to the Utah Statewide Immunization Information System (USIIS) USIIS The Utah Statewide Immunization Information System (USIIS) is a secure, confidential immunization information system that helps healthcare providers, schools, child care centers and Utah residents maintain consolidated immunization histories.USIIS login portalopens in a new tabAbout USIIS The Utah Statewide Immunization Information System (USIIS) is a free, confidential, web-based information system … Continue reading USIIS