Why Modern Immunization Information Systems are Public Health Platforms

When the next public health emergency hits, a modern immunization information system (IIS) isn’t optional. States that update their legacy IIS are doing more than making an IT decision. They’re investing in a public health platform capable of doing far more than recording vaccinations.

Built for Another Era

IIS have been making patients’ immunization data increasingly useful since the 1990s. They consolidate data into a single record for tracking immunization status, avoiding duplicate vaccinations, and managing vaccine inventory. But many current immunization systems operate on outdated technology. Data is siloed, and operational bottlenecks are the norm. COVID-19 demonstrated the value of using IIS for adult vaccination tracking, but it also exposed how overburdened these aging systems had become even then.

The Case for Modernization Now

With federal funding for state immunization programs under pressure, states are spending more than they have to maintain systems that weren’t designed to meet today’s interoperability standards or cybersecurity protections.

At the same time, the experienced professionals who have been running these systems for decades are retiring, taking institutional knowledge with them. Most new program directors recognize that they are inheriting systems that don’t match the flexibility and adaptability of modern cloud-based IIS.

The Hidden Power of IIS Modernization

But these program directors may not realize the full value of modernizing their IIS. Modernization creates a public health platform that can improve health outcomes while lowering the cost of care.

Data makes this possible.

A modern IIS transforms immunization data from the individual level to the population level into public health intelligence. Most IIS have historically focused on tracking children’s immunizations. Yet every state currently operates an IIS that is capable of tracking adult immunizations. When IIS capture comprehensive data throughout a person’s life regardless of where care is received, these systems can do so much more:

• Data Accessibility. Modern IIS exchange data with electronic medical record systems, hospital systems, and providers for a new level of visibility. States can identify coverage gaps and connect different data types for a fuller picture of community health. And program staff can easily query data themselves and schedule recurring reports without relying on a vendor to do it for them.

• School Compliance. States can choose to add school modules to their IIS that make it possible for school administrators to monitor student vaccination status ahead of enrollment. It’s an effective way for schools to stay ahead of state requirements and proactively alert parents before the first day of school if their child is missing required vaccinations.
• Population Health Tracking. Layering in public health monitoring onto the IIS infrastructure gives states a picture of community health and the social determinants of health. For example, when lead levels spike in a ZIP code, data connects environmental threats to at-risk populations. Or providers can use children’s vision screening data to recommend follow-ups with specialists. And when a mother tests positive for hepatitis B, the system supports case tracking.

• Outbreak Readiness. A modern IIS organizes population data in ways that become critical in a public health crisis. States can categorize residents by occupation, geography, and priority group. Whether it’s a disease, problem with the water supply, mass vaccination event, or something else, states already know who needs health information and how to get it to them.  

• Fraud Detection. When integrated with Medicaid claims data, a modern IIS can identify providers billing for vaccines they received at no cost through public immunization programs. This is a significant and underexamined source of healthcare fraud. As scrutiny on public health spending intensifies, states with modern, interoperable IIS systems have a tool that can support more recoveries and stronger fraud deterrence.

The Stakes Go Beyond Immunization

IIS today are public health platforms in the fullest sense. They give states the data infrastructure to turn immunization management into a broader public health asset. While modernization is a commitment, states that invest in it are building something that will work harder for public health than their legacy system ever could.