61 people have contacted by health authorities in Gwynedd after coming into into contact with a staff member at surgery who had measles.
The worker, based at Bronmeirion Surgery, Penrhyndeudraeth, is thought to have been at work for two days while infectious.
The people thought to be at risk have all been contacted by letter or telephone and have been offered the MMR vaccine as a precaution
42 people have already been diagnosed with measles - 30 of them at Ysgol Eifionydd School, Porthmadog. The other 12, whilst local to the area, aren't thought to have direct links to the outbreak
Public Health Wales say that "the majority of cases" have either had no MMR vaccination or only one dose.
More top news
Often clear skies this evening will allow for frost to develop. Low cloud will then roll in overnight, making the frost more localised.
Northampton Saints' Director of Rugby has denied that Wales international George North was knocked out during their game against Leicester.
Swansea defender Jordi Amat insists manager Bob Bradley has the backing of the players despite yesterday's 5-0 defeat to Tottenham.