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HLN's Immunization Calculation Engine (ICE) is continually updated to support new COVID-19 recommendations

By: PRLog

MISSION VIEJO, Calif. - March 20, 2023 - PRLog -- HLN's Immunization Calculation Engine (ICE) open-source software system helps clinicians, public health, and individuals stay on top of ever-changing and increasingly complex immunization recommendations. For COVID-19 alone, HLN released more than ten updates to ICE since the pandemic began in 2020. These updates support accurate evaluation and forecasting of COVID-19 immunizations, helping ensure individuals stay up to date given the latest Centers for Disease Control and Prevention (CDC) and Advisory Committee on Immunization Practices (ACIP) recommendations.

In its latest update (v 1.38.1) released on March 17, 2023, HLN added support for additional COVID vaccines and made necessary changes to the booster recommendations. Additional DTP and Polio vaccines were also added, as well as some minor logic changes to rules related to Orthopoxvirus and Hep B. You can see release notes for all ICE versions, as well as complete documentation, runtime and source code.

ICE supports COVID-19 recommendations for FDA-authorized and ACIP-approved vaccines, WHO-authorized vaccines, and vaccine candidates active in U.S.-based clinical trials. HLN will continue to monitor vaccine updates to ensure ICE supports the latest immunization recommendations for children, adolescents, and adults for COVID-19 and across sixteen additional vaccine groups.

By translating recommendations into a rules-based service available for use in immunization information systems (IIS), electronic health record (EHR) systems, and personal health record (PHR) systems, ICE provides decision support on what immunizations are due and when. Recognized by the U.S. Department of Health and Human Services National Vaccine Program Office and the Digital Public Goods Alliance, ICE is an innovative tool to support clinical immunization workflows and decrease the burden of preventable disease. Interested to learn more about this free, open-source service and learn how it can support your immunization needs? See and reach out to

About HLN

HLN is a leading public health informatics consulting company providing software development and technical support services to immunization information systems (IIS) as well as other public health systems for more than twenty-five years. HLN is focused on leveraging an open source collaborative development model as the most efficient and cost-effective way to build and support robust technical solutions that address pressing public health needs.

HLN's experience includes all phases of the lifecycle of public health systems projects, including IIS, from design and development to operations and support. HLN supports both waterfall and Agile methodologies depending on the needs of the client. Much of our open source work is focused on clinical decision support (CDS) applications built using OpenCDS, an open-source clinical decision support platform. This includes our Immunization Calculation Engine (ICE) and Reportable Condition Knowledge Management System (RCKMS). RCKMS supports the national strategy of electronic case reporting (eCR) to public health organizations. HLN is part of the eCR team which was recently awarded the CDC Excellence in Partnership Award and CSELS Director's Award for Innovation.

More information on HLN Consulting and its open source products can be found at

Noam H. Arzt, PhD

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