The JCVI recently reviewed the potential health benefits of an immediate additional booster dose for the most vulnerable in response to the current Omicron wave.
Yn ddiweddar, adolygodd y JCVI y buddion iechyd posibl i’r unigolion mwyaf agored i niwed o gael dos atgyfnerthu ychwanegol yn syth mewn ymateb i’r don bresennol o’r amrywiolyn Omicron.