Rhoddodd yr Asiantaeth Rheoleiddio Meddyginiaethau a Chynhyrchion Gofal Iechyd gyngor ar ddyfeisiau gwresogi-oeri sy’n achosi haint i ganolfannau llawdriniaethau ym mis Tachwedd 2015, ar ôl i’r risg y gallai cleifion ddal yr haint bacterium chimaera gael ei nodi. Ni nodwyd unrhyw achosion o’r haint mewn cleifion sydd wedi cael llawdriniaeth yn y DU ers i’r canllawiau hyn gael eu cyhoeddi.
Advice on contaminating heater cooler devices was issued to surgical centres in November 2015 by the Medicines and Healthcare Products Regulatory Agency (MHRA) after Mycobacterium chimaera infection risk was identified.  No cases of the infection have been identified in patients who had surgery in the UK since this guidance was published.