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.D18.S.Typhoid.Ty21a schedule

Official URL: http://smart.who.int/immunizations/PlanDefinition/IMMZD18STyphoidTy21a Version: 1.0.0
Draft as of 2026-10-02 Computable Name: IMMZD18STyphoidTy21a

IMMZ.D18.S.Typhoid.Ty21a schedule Live attenuated Ty21a vaccine, 3-dose schedule

Id: IMMZD18STyphoidTy21a
Url: IMMZ.D18.S.Typhoid.Ty21a schedule
Version: 1.0.0
Title: IMMZ.D18.S.Typhoid.Ty21a schedule
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.D18.S.Typhoid.Ty21a schedule Live attenuated Ty21a vaccine, 3-dose schedule
Knowledge Capability: computable
Related Artifacts:

References

  • ​

    WHO recommendations for routine immunization - summary tables (January 2025)
Libraries:
IMMZD18STyphoidTy21aLogic
Actions:
Typhoid Ty21a primary series: Provision of the typhoid Ty21a, 3-dose oral primary series immunization Trigger event: Child's birth Trigger pseudo: Trigger date: "Date of birth" Create condition: Ty21a – 3-doses to be administered orally every second day from 6 years of age.
If: Applicability: Typhoid Ty21a primary series (Typhoid Ty21a primary series)
Then: Definition: IMMZ.D2.DT.CR
Dynamic Values:
status: ('active')
payload.contentString: (Typhoid Ty21a primary series Create)
category.coding: (Code { system: 'http://terminology.hl7.org/CodeSystem/communication-category', code: 'alert' })
priority: (Code { system: 'http://hl7.org/fhir/request-priority', code: 'routine' })
Typhoid booster dose(s) repeat 3-doses series: Provision of the typhoid booster dose(s): revaccination Trigger event: The primary series has been completed Trigger pseudo: "Completed the primary vaccination series" = TRUE (where "Vaccine type" = "Typhoid vaccines") Trigger date: Latest "Date and time of vaccination" (where "Vaccine type" = "Typhoid vaccines") Create condition: Revaccination (3-doses) is recommended every 3–7 years for Ty21a.
If: Applicability: Typhoid booster dose(s) repeat 3-doses series (Typhoid booster dose(s) repeat 3-doses series)
Then: Definition: IMMZ.D2.DT.CR
Dynamic Values:
status: ('active')
payload.contentString: (Typhoid booster dose(s) repeat 3-doses series Create)
category.coding: (Code { system: 'http://terminology.hl7.org/CodeSystem/communication-category', code: 'alert' })
priority: (Code { system: 'http://hl7.org/fhir/request-priority', code: 'routine' })