Mae Arolwg Heintiadau Covid-19 y Swyddfa Ystadegau Gwladol wedi chwarae rhan bwysig iawn o ran sicrhau gwyliadwriaeth gymunedol o heintiadau Covid-19 drwy gydol y pandemig.
The Covid-19 Infection Survey run by the ONS has played a very important role in the community surveillance of Covid-19 infections throughout the course of the pandemic.