Immunization Information System

SSG has implemented an Open Source Immunization Information System

The Immunization Information System – Open Source, IIS-OS, is a fully featured Open Source and Open Data Format system, designed from scratch and driven by national IIS guidelines. Realizing that the requirements for Immunization Information Systems sometimes differ across states, the IIS-OS has been designed and built for flexibility and configuration.

IIS-OS is a secure and confidential, web-based system that enables healthcare providers to appropriately immunize children and adults against vaccine preventable diseases. The IIS-OS allows you to:

  • Manage the immunization process
  • Automatic inventory management of vaccines
  • Improve health through pro-active clinical decision support
  • Enhance emergency and pandemic response capabilities by ensuring healthcare providers have the vaccines required to respond
  • Report and track vaccinations across the population
  • Improve Immunization Program operations by automating key business workflows
  • Improve IT infrastructure through utilization of n-tiered, services oriented architecture
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Contact us to learn more about IIS-OS:

Why Use IIS-OS?

Benefit from Open Source and Open Data Format: No Vendor Lock-in, More Control.

Aside from the more modern architecture, one of the key differentiators of IIS-OS is the fact that IIS-OS is 100% Open Source, Open Standards based, and utilizes 100% Open Data Formats. This aligns with SSG beliefs that publicly funded projects should be available to the public, rather than have vendors charge multiple states for the same product, asking tax payers to buy products multiple times over.

The advantages of the IIS-OS Open Source and Open Data platform are the following:


  • IIS-OS has no initial or long term licensing fees
  • No expenses on upgrades


  • No restrictions on number of deployments
  • Address issues directly


  • Complete control of source code
  • No risk of losing vendor support for product
  • No risk of changing pricing structures from vendors
  • Direct access to code allows opportunities for continuous process improvement
Functionality and Modules.

The following diagram includes the functionality and modules within the current IIS-OS release.

Realize the Strengths of an Architecture Superior to the Competition. More Flexibility. More Efficient Technology.

The IIS-OS architecture utilizes current state-of-the-art design patterns and practices to ensure a flexible and robust application framework. At a high level, the following are some of the key design principals:

n-Tiered, Modular Design.

The IIS-OS design implements true separation of concerns and Model View Controller design by completely separating the Presentation Tier, Middle Tier and Database Tier of the application and ensuring that only the appropriate processes are implemented within each tier. The IIS-OS utilizes industry standard web services for module interactions and system-to-system interactions.
Modern programming frameworks.

As a newly developed system, IIS-OS utilizes programming frameworks (such as Hibernate, Spring, etc.) that did not exist at the time when many other IIS systems in the market were built. These programming frameworks are much more sophisticated, powerful and easier to use than their predecessors.
Platform independence.

The IIS-OS is platform independent and does not require expensive proprietary platform tools to function. It is built using Java (rather than Microsoft .NET), so avoids always being locked into using and paying for the Microsoft tool set and server platforms.
Designed with the entire end goal in mind.

The IIS-OS was designed from the ground up with the full scope of the project in mind, so the architecture is one that was planned knowing the full breadth of the toolset and functionality in mind. Other IIS systems in the market were started over a decade ago, so include very old code and utilize a patchwork of software languages and design patterns, some of which are antiquated. Often companies will refactor legacy code over time; in the IIS market however, the incentive to do so often does not exist. These systems may meet the functional needs, but the maintenance, flexibility and scalability are not nearly as efficient as IIS-OS.

For more information about the functionality or architecture of the IIS-OS, please contact us.