What does an Immunization Information System (IIS) primarily track?

An Immunization Information System (IIS) primarily tracks immunization-related data, which includes details such as the types of vaccines administered, dates of vaccination, and the individual who received the immunization. The purpose of an IIS is to maintain an accurate and up-to-date record of immunizations for individuals, which is crucial for public health efforts, ensuring that individuals are vaccinated according to schedule, and reducing the prevalence of vaccine-preventable diseases.

The system serves as a centralized database that allows healthcare providers to access patient records and verify immunization histories, thereby facilitating better healthcare decisions and improving overall vaccination rates in the community. This tracking is essential for monitoring vaccination coverage levels, identifying populations at risk for vaccine-preventable diseases, and aiding in outbreak investigations.

Other options, such as tracking medication prescriptions, hospital admissions, or patient demographics, do not align with the specific function of an IIS, which is focused solely on immunization data.