Mae gan ddeg o’r achosion hyn gysylltiadau clir â De Affrica neu â theithio rhyngwladol. Yn y tri achos arall, nid oes unrhyw dystiolaeth glir ar hyn o bryd sut y gallent fod wedi dal y feirws.
Ten of these cases have clear links to either South Africa or to international travel. In the other three cases, there is currently no clear evidence of how they may have caught the virus.