Id: IMMZD2DTTyphoidTy21a
Url: IMMZ.D2.DT.Typhoid.Ty21a
Version: 1.0.0
Title: IMMZ.D2.DT.Typhoid.Ty21a
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.Typhoid.Ty21a Live attenuated Ty21a vaccine schedule
Knowledge Capability: computable
Related Artifacts:

References

  • WHO recommendations for routine immunization - summary tables (January 2025)
Libraries:
IMMZD2DTTyphoidTy21aLogic
Actions:
Determine if the client is due for Typhoid.: Determine if the client is due for Typhoid vaccine according to the national immunization protocol. Live attenuated Ty21a vaccine schedule
If: Applicability: Client is due for Typhoid vaccination (Client is due for Typhoid vaccination)
Then: Definition: IMMZD2DTMR
Dynamic Values:
status: ('draft')
intent: ('proposal')
medication: (Concept { codes: { Code { system: 'http://smart.who.int/immunizations/CodeSystem/IMMZ.Z', code: 'DE21', display: 'Typhoid vaccines' } }, display: 'Typhoid vaccines' })
Determine if the client is due for Typhoid.: Determine if the client is due for Typhoid vaccine according to the national immunization protocol. Live attenuated Ty21a vaccine schedule
If: Applicability: Client is due for typhoid booster dose (Client is due for typhoid booster dose)
Then: Definition: IMMZD2DTMR
Dynamic Values:
status: ('draft')
intent: ('proposal')
medication: (Concept { codes: { Code { system: 'http://smart.who.int/immunizations/CodeSystem/IMMZ.Z', code: 'DE21', display: 'Typhoid vaccines' } }, display: 'Typhoid vaccines' })
Check for Guidance for the patient regarding IMMZ.D2.DT.Typhoid.Ty21a.: Show Guidance for the patient regarding IMMZ.D2.DT.Typhoid.Ty21a.
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.Typhoid.Ty21a Live attenuated Ty21a vaccine schedule"/> <relatedArtifact> <type value="citation"/> <citation value="WHO recommendations for routine immunization - summary tables (January 2025)"/> </relatedArtifact> <library value="http://smart.who.int/immunizations/Library/IMMZD2DTTyphoidTy21aLogic"/> <action> <extension url="http://hl7.org/fhir/uv/cpg/StructureDefinition/cpg-rationale"> <valueMarkdown value="For Ty21a, a 3-dose oral immunization schedule, administering the vaccine every second (alternate) day, is recommended above 6 years of age. If interruption between doses is > 21 days, restart primary series."/> </extension> <title value="Determine if the client is due for Typhoid."/> <description value="Determine if the client is due for Typhoid vaccine according to the national immunization protocol. Live attenuated Ty21a vaccine schedule"/> <condition> <kind value="applicability"/> <expression> <description value="Client is due for Typhoid vaccination"/> <language value="text/cql-identifier"/> <expression value="Client is due for Typhoid 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: 'DE21', display: 'Typhoid vaccines' } }, display: 'Typhoid vaccines' }"/> </expression> </dynamicValue> </action> <action> <extension url="http://hl7.org/fhir/uv/cpg/StructureDefinition/cpg-rationale"> <valueMarkdown value="Revaccination is recommended every 3–7 years for Ty21a (every 1 to 7 years for travellers from non-endemic to endemic areas, depending on national policies). As a general rule, any live vaccine may be given either simultaneously or at an interval of 4 weeks."/> </extension> <title value="Determine if the client is due for Typhoid."/> <description value="Determine if the client is due for Typhoid vaccine according to the national immunization protocol. Live attenuated Ty21a vaccine schedule"/> <condition> <kind value="applicability"/> <expression> <description value="Client is due for typhoid booster dose"/> <language value="text/cql-identifier"/> <expression value="Client is due for typhoid booster dose"/> </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: 'DE21', display: 'Typhoid vaccines' } }, display: 'Typhoid vaccines' }"/> </expression> </dynamicValue> </action> <action> <title value="Check for Guidance for the patient regarding IMMZ.D2.DT.Typhoid.Ty21a."/> <description value="Show Guidance for the patient regarding IMMZ.D2.DT.Typhoid.Ty21a."/> <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>