Electronic Access to Immunization Information among Primary Care Physicians

State immunization information systems (IIS), also known as immunization registries, are population-based databases that record vaccinations administered by participating health care providers in a given state (1). Most states require providers to report certain vaccinations—frequently childhood immunizations—to their state’s IIS (2). IIS also became more commonly used to record adult vaccinations during the COVID-19 pandemic. Primary care physicians (PCPs), in particular, play a key role in administering and reporting immunizations to IIS, which are an important source of information for parents and the general public, as well as for assisting public health authorities with resource allocation, identifying populations at-risk for vaccine preventable disease, and informing programs to increase vaccination coverage (3).