In the first months of the pandemic, we advised thousands of people, who were at the greatest risk of contracting the virus and of coming to serious harm as a consequence, to shield.
Yn ystod misoedd cyntaf y pandemig, fe wnaethom gynghori miloedd o bobl, a oedd yn wynebu'r risg fwyaf o ddal y feirws ac o gael niwed difrifol yn sgil hynny, i warchod eu hunain.