This case-sensitive code system http://fhir.ch/ig/ch-vacd/CodeSystem/ch-vacd-clinical-decision-support-event-cs defines the following codes:

Code	Display
immunrecorequest	Immunization Recommendation Request
immunrecoresponse	Immunization Recommendation Response

Additional Language Displays

Code	Deutsch (Schweiz) (German (Switzerland), de)	English (United States) (English (United States), en)	French (Switzerland) (fr)	Italian (Switzerland) (it)	rm
immunrecorequest	Immunization Recommendation Request	Immunization Recommendation Request	Immunization Recommendation Request	Immunization Recommendation Request	Immunization Recommendation Request
immunrecoresponse	Immunization Recommendation Response	Immunization Recommendation Response	Immunization Recommendation Response	Immunization Recommendation Response	Immunization Recommendation Response