Pan fydd brigiad o achosion, gellid gofyn i fyfyrwyr a staff sydd heb eu brechu, neu sydd heb gael dos llawn o'r brechlyn, i ynysu am hyd at 21 diwrnod i atal y clefyd ffyrnig iawn hwn rhag lledaenu.
In the event of an outbreak, students and staff who are unvaccinated or under vaccinated could be asked to isolate for up to 21 days to stop the spread of this very virulent disease.