TechNet-21 - Forum

This forum provides a place for members to ask questions, share experiences, coordinate activities, and discuss recent developments in immunization.
  1. Lux Phatak
  2. Immunization information systems & coverage monitoring
  3. Friday, 29 October 2021

ice logo transparentOn October 25, 2021, HLN released a new version (v1.31.1) of the Immunization Calculation Engine (ICE) in support of updates to the COVID-19 vaccine. ICE is a state-of-the-art open source software system that provides clinical decision support for immunizations for use in Immunization Information Systems (IIS), Electronic Health Record (EHR), and Personal Health Record (PHR) Systems.

  • COVID-19 Update: 
    • Added additional support and logic in ICE to handle the following:
      • COVID-19 Booster Dose for Pfizer Vaccine
  • Performance Improvement

Note about Upcoming ICE Release (Tentatively Scheduled for November 2021)

  • As always, HLN is actively monitoring all news and updates in regards to new and existing COVID-19 vaccines. For the next ICE release, we will be working on adding additional support and logic (based on the latest published guidance) in ICE and may include some or all of the following changes:
    • COVID-19 Booster Dose for Moderna and Janssen Vaccines
    • Pfizer COVID-19 Vaccine for Patients Age 5 - 11 years old
    • Mixing and Matching COVID Vaccines

The full software release is available for download at 

Plans for COVID-19 Support in ICE

Once a vaccine has been approved for use by the FDA (either Expanded Access, EUA, or full licensure), the Advisory Committee on Immunization Practices (ACIP) will hold an emergency meeting and publish recommendations in a very quick time frame (i.e., days). HLN intends to release a version of ICE that includes updated COVID-19 forecasting as early as possible. The initial release will contain COVID-19 logic that is known at the time of the release. As additional, relevant information on COVID-19 becomes available from official sources, HLN will continue to release additional versions of ICE, at appropriate times.

If you have any questions, comments or suggestions, please e-mail us at

See the feature article about ICE in Open Health News.

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