All individuals aged 16 years to 64 years with underlying health conditions [ footnote 1 ], which put them at higher risk of serious disease and mortality.
Pawb sydd rhwng 16 mlwydd oed a 64 mlwydd oed sydd â chyflwr iechyd sy’n bodoli eisoes [ troednodyn 1 ], sy’n golygu eu bod mewn mwy o berygl o salwch difrifol a marwolaeth