Ym mis Mawrth 2020, roeddem yn gwybod llawer llai am SARS-CoV-2 a sut yr oedd yn cael ei drosglwyddo o berson i berson nag yr ydym heddiw. Ledled y byd, rydym wedi parhau i ddysgu mwy am y feirws – a sut i drin a rheoli heintiadau – gyda phob wythnos a mis sydd wedi mynd heibio.
In March 2020, we knew a lot less about SARS-CoV-2 and how it was transmitted from person to person than we do today. All around the world, we have continued to learn more about this virus – and how to treat and control infection – with every week and month which has passed.