Ar 7 Ionawr, cyhoeddodd y Cyd-bwyllgor ar Imiwneiddio a Brechu (JCVI) ddatganiad a oedd yn cynnwys gwybodaeth am y rhaglen brechlynnau atgyfnerthu a’r amrywiolyn Omicron. Gwnaethant hefyd ddyfynnu tystiolaeth a oedd yn awgrymu bod y rhaglen frechu wedi rhoi lefelau uchel o ddiogelwch yn erbyn salwch difrifol o ganlyniad i COVID-19 (amrywiolion Delta ac Omicron) ar draws y boblogaeth. 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. Fodd bynnag, ar hyn o bryd rhoddodd y JCVI wybod mai blaenoriaeth y rhaglen brechlynnau atgyfnerthu COVID-19 yw cynyddu nifer yr oedolion sydd wedi cael y pigiad atgyfnerthu cyntaf a phwysleisiwyd pwysigrwydd rhoi dos cyntaf i unigolion sydd heb eu brechu, yn enwedig oedolion agored i niwed. Bydd y JCVI yn parhau i fonitro’r rhaglen atgyfnerthu ac adolygu’r posibilrwydd y bydd angen ail bigiad atgyfnerthu.
On 7 January, the Joint Committee on Vaccination and Immunisation (JCVI) published a statement, which included information about the booster programme and the Omicron variant. They also cited evidence, which indicated that the booster programme has provided high levels of protection against severe disease from COVID-19 (both Delta and Omicron variants) across the population. 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. Though at this time, JCVI advised that the priority for the COVID-19 booster programme remains increasing coverage of the first booster dose across the adult population and stressed the importance of unvaccinated individuals, especially vulnerable adults, receiving a primary course of vaccination. The JCVI will continue to monitor the booster programme and keep under review the possibility of whether second boosters are needed.