Yn y cyngor blaenorol a roddais am y cyfnod atal byr, dywedais mai cyfnod o bythefnos fyddai’r cyfnod byrraf a fyddai’n debygol o gael effaith, a nodais y byddai cyfnod hwy yn cael mwy o effaith. Yn ddiweddar, rydym wedi gweld bod yr ymyriadau a waned yng Ngogledd Iwerddon (a oedd yn cynnwys cau’r diwydiant lletygarwch am gyfnod o bedair wythnos) wedi arwain at leihad sylweddol yn yr Rt, a bod rhai o’r tueddiadau difrifol mewn perthynas â’r gwasanaeth iechyd wedi’u gwrth-droi. Nodaf fod Lloegr wedi dewis rhoi cyfyngiadau symud cenedlaethol yn eu lle am fis, a dylem barhau i fonitro effaith hyn.
In my earlier advice about the firebreak I noted that a two week period was the minimum duration which would be likely to have an impact and I noted that a longer duration would have a greater effect. We have recently seen the interventions in Northern Ireland (which involved a four week period during which hospitality industry was closed) have led to a significant reduction in Rt and the reversal of some adverse health service trends. I note that England has elected to impose a month-long national lockdown and we should continue to monitor its impact.