Cafwyd datganiad ym mis Medi 2017 i’r perwyl nad oedd unrhyw achosion o ffliw adar yn y DU, ac ni chafwyd unrhyw achosion o ffliw adar pathogenig iawn ers hynny. Fodd bynnag, dychwelodd math pathogenig isel o'r clefyd, H5N3, nad yw'n fygythiad i iechyd pobl, ym mis Rhagfyr 2019 a gweithredodd y Llywodraeth yn gyflym i fynd i’r afael ag ef. Gwnaeth y DU ddatganiad ym mis Mehefin 2020 i’r perwyl nad oedd ynddi unrhyw achosion o ffliw adar.
The UK was previously declared free of avian flu in September 2017 and has remained free of highly pathogenic avian influenza since then. However, a low pathogenic H5N3 strain of the disease, which poses no threat to human health, returned in December 2019 and was quickly dealt with by Government action. The UK declared itself free from avian influenza in June 2020.