Id: IMMZD2DTVaricella2Doses
Url: IMMZ.D2.DT.Varicella.2 doses
Version: 1.0.0
Title: IMMZ.D2.DT.Varicella.2 doses
Status: draft
Type:

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

code: eca-rule

Date: 2026-03-31 13:54:17+0000
Publisher: WHO
Description:

IMMZ.D2.DT.Varicella.2 doses 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:
IMMZD2DTVaricella2DosesLogic
Actions:
Determine if the client is due for Varicella.: Determine if the client is due for Varicella vaccine according to the national immunization protocol. 2-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.2 doses.: Show Guidance for the patient regarding IMMZ.D2.DT.Varicella.2 doses.
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' })
<type> <coding> <system value="http://terminology.hl7.org/CodeSystem/plan-definition-type"/> <code value="eca-rule"/> </coding> </type> <status value="draft"/> <experimental value="false"/> <date value="2026-03-31T13:54:17+00:00"/> <publisher value="WHO"/> <contact> <name value="WHO"/> <telecom> <system value="url"/> <value value="http://who.int"/> </telecom> </contact> <description value="IMMZ.D2.DT.Varicella.2 doses 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."/> <relatedArtifact> <type value="citation"/> <citation value="WHO recommendations for routine immunization - summary tables (January 2025)"/> </relatedArtifact> <library value="http://smart.who.int/immunizations/Library/IMMZD2DTVaricella2DosesLogic"/> <action> <extension url="http://hl7.org/fhir/uv/cpg/StructureDefinition/cpg-rationale"> <valueMarkdown value="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. Depending on the goal of the vaccination programme, 1–2 doses should be given with the first dose administered at 12–18 months of age. Varicella-containing vaccine can be administered concomitantly with other vaccines included in the routine childhood immunization programme. Unless given together with other live viral vaccines (measles, MR [measles and rubella], MMR [measles, mumps and rubella]), it should be administered at a minimum interval of 28 days. The minimum interval between doses should be as recommended by the manufacturer, ranging from 4 weeks to 3 months."/> </extension> <title value="Determine if the client is due for Varicella."/> <description value="Determine if the client is due for Varicella vaccine according to the national immunization protocol. 2-dose schedule"/> <condition> <kind value="applicability"/> <expression> <description value="Client is due for varicella vaccination"/> <language value="text/cql-identifier"/> <expression value="Client is due for varicella vaccination"/> </expression> </condition> <definitionCanonical value="http://smart.who.int/immunizations/ActivityDefinition/IMMZD2DTMR"/> <dynamicValue> <path value="status"/> <expression> <language value="text/cql-expression"/> <expression value="'draft'"/> </expression> </dynamicValue> <dynamicValue> <path value="intent"/> <expression> <language value="text/cql-expression"/> <expression value="'proposal'"/> </expression> </dynamicValue> <dynamicValue> <path value="medication"/> <expression> <language value="text/cql-expression"/> <expression value="Concept { codes: { Code { system: 'http://smart.who.int/immunizations/CodeSystem/IMMZ.Z', code: 'DE22', display: 'Varicella-containing vaccines' } }, display: 'Varicella-containing vaccines' }"/> </expression> </dynamicValue> </action> <action> <title value="Check for Guidance for the patient regarding IMMZ.D2.DT.Varicella.2 doses."/> <description value="Show Guidance for the patient regarding IMMZ.D2.DT.Varicella.2 doses."/> <condition> <kind value="applicability"/> <expression> <description value="Has Guidance"/> <language value="text/cql-identifier"/> <expression value="Has Guidance"/> </expression> </condition> <definitionCanonical value="http://smart.who.int/immunizations/ActivityDefinition/IMMZD2DTCR"/> <dynamicValue> <path value="status"/> <expression> <language value="text/cql-expression"/> <expression value="'active'"/> </expression> </dynamicValue> <dynamicValue> <path value="payload.contentString"/> <expression> <language value="text/cql-identifier"/> <expression value="Guidance"/> </expression> </dynamicValue> <dynamicValue> <path value="category.coding"/> <expression> <description value="Category of communication"/> <language value="text/cql-expression"/> <expression value="Code { system: 'http://terminology.hl7.org/CodeSystem/communication-category', code: 'alert' }"/> </expression> </dynamicValue> <dynamicValue> <path value="priority"/> <expression> <description value="Alert priority"/> <language value="text/cql-expression"/> <expression value="Code { system: 'http://hl7.org/fhir/request-priority', code: 'routine' }"/> </expression> </dynamicValue> </action> </PlanDefinition>