Ceisiodd Bwrdd Iechyd Prifysgol Caerdydd a'r Fro gyngor proffesiynol annibynnol gan yr Athro Mike Sharland o'r Grŵp Ymchwilio i Glefydau Heintus Pediatrig ym Mhrifysgol St George, Llundain. Cadarnhaodd yntau bod yr ymateb i'r achosion wedi bod yn drwyadl ac effeithiol, ac nad oedd angen ymyrraeth bellach. Nododd yr Athro Sharland hefyd fod achosion o'r fath yn para am gyfnod hir ac er gwaetha'r ffaith nad oes achosion pellach yn cael eu cofnodi, roedd yn bosibl y gallai rhagor ddatblygu er bod yr holl ymyriadau priodol ar waith.
Cardiff and Vale University Health Board sought expert independent professional advice from Professor Mike Sharland, of the Paediatric Infectious Diseases Research Group, at St George’s University, London. He confirmed there had been a very thorough and well conducted outbreak response and that no additional interventions were warranted. Professor Sharland also highlighted that such outbreaks are prolonged and despite no further cases being recorded it was possible that more may occur even with all appropriate interventions being taken.