Mae dau o’r achosion hyn yn y Gogledd – yn Sir Fôn ac yng Nghonwy. Mae ganddynt yr un dilyniant genom, a chawsant eu profi ar yr un diwrnod. Yng Nghastell-nedd Port Talbot mae’r trydydd achos.
Two of these cases are in North Wales – in Anglesey and in Conwy. They have the same genetic sequence and they were tested on the same day. The third case is in Neath Port Talbot.