Mae’r Cyd-bwyllgor ar Imiwneiddio a Brechu hefyd wedi argymell y dylid blaenoriaethu cynigion brechu ôl-gysylltiad pan fo cyflenwadau’n gyfyngedig. Bydd brechu ôl-gysylltiad ar gyfer y rheini sydd wedi dod i gysylltiad â’r feirws yn cael ei flaenoriaethu ar gyfer pobl sydd â’r risg fwyaf o ddioddef salwch difrifol, gan gynnwys plant dan bump oed, menywod beichiog, a phobl imiwnoataliedig difrifol. Yn ogystal â hyn, gallai pobl sy’n gymwys i gael brechiad cyn-gysylltiol, er enghraifft dynion hoyw a deurywiol risg uchel, gael cynnig brechiad ôl-gysyllltiad.
The JCVI has also recommended that during periods of supply constraint, post exposure vaccination offers should be prioritised. Post exposure vaccination for contacts will be prioritised for those at greater risk of severe disease, including children under the age of five, pregnant women and people who are severely immunosuppressed. In addition, people eligible for pre-exposure vaccination, for example high risk Gay and Bisexual men, may be offered post-exposure vaccination.