WHO Immunization Implementation Guide
1.0.0 - release

This page is part of the Immunizations (v1.0.0: Release) based on FHIR (HL7® FHIR® Standard) R4. This is the current published version in its permanent home (it will always be available at this URL). For a full list of available versions, see the Directory of published versions

PlanDefinition: IMMZ.D2.DT.Varicella.1 dose

Official URL: http://smart.who.int/immunizations/PlanDefinition/IMMZD2DTVaricella1Dose Version: 1.0.0
Draft as of 2026-10-02 Computable Name: IMMZD2DTVaricella1Dose

IMMZ.D2.DT.Varicella.1 dose Countries where varicella is an important public health burden could consider introducing varicella vaccination in the routine childhood immunization programme. However, resources should be sufficient to ensure reaching and sustaining vaccine coverage ≥ 80%. Decision-making on childhood varicella vaccination should also include consideration of the possible impact on herpes zoster. The number of doses recommended is dependent on the goal of the vaccination programme. One dose is sufficient to reduce mortality and severe morbidity from varicella but not to prevent limited virus circulation and outbreaks. Two doses have higher effectiveness and should therefore be recommended in countries where the programmatic goal is, in addition to decreasing mortality and severe morbidity, to further reduce the number of cases and outbreaks.

Id: IMMZD2DTVaricella1Dose
Url: IMMZ.D2.DT.Varicella.1 dose
Version: 1.0.0
Title: IMMZ.D2.DT.Varicella.1 dose
Status: draft
Type:

system: http://terminology.hl7.org/CodeSystem/plan-definition-type

code: eca-rule

Date: 2026-10-02 09:40:20+0000
Publisher: WHO
Description:

IMMZ.D2.DT.Varicella.1 dose Countries where varicella is an important public health burden could consider introducing varicella vaccination in the routine childhood immunization programme. However, resources should be sufficient to ensure reaching and sustaining vaccine coverage ≥ 80%. Decision-making on childhood varicella vaccination should also include consideration of the possible impact on herpes zoster. The number of doses recommended is dependent on the goal of the vaccination programme. One dose is sufficient to reduce mortality and severe morbidity from varicella but not to prevent limited virus circulation and outbreaks. Two doses have higher effectiveness and should therefore be recommended in countries where the programmatic goal is, in addition to decreasing mortality and severe morbidity, to further reduce the number of cases and outbreaks.
Knowledge Capability: computable
Related Artifacts:

References

  • ​

    WHO recommendations for routine immunization - summary tables (January 2025)
Libraries:
IMMZD2DTVaricella1DoseLogic
Actions:
Determine if the client is due for Varicella.: Determine if the client is due for Varicella vaccine according to the national immunization protocol. 1-dose schedule
If: Applicability: Client is due for varicella vaccination (Client is due for varicella vaccination)
Then: Definition: IMMZD2DTMR
Dynamic Values:
status: ('draft')
intent: ('proposal')
medication: (Concept { codes: { Code { system: 'http://smart.who.int/immunizations/CodeSystem/IMMZ.Z', code: 'DE22', display: 'Varicella-containing vaccines' } }, display: 'Varicella-containing vaccines' })
Check for Guidance for the patient regarding IMMZ.D2.DT.Varicella.1 dose.: Show Guidance for the patient regarding IMMZ.D2.DT.Varicella.1 dose.
If: Applicability: Has Guidance (Has Guidance)
Then: Definition: IMMZ.D2.DT.CR
Dynamic Values:
status: ('active')
payload.contentString: (Guidance)
category.coding: (Code { system: 'http://terminology.hl7.org/CodeSystem/communication-category', code: 'alert' })
priority: (Code { system: 'http://hl7.org/fhir/request-priority', code: 'routine' })