Medical experts say there's been a four-fold rise in the number of Welsh cases of measles this year, compared to the previous 12 months.
From January to June there were 61 cases.
Public Health Wales says raising MMR vaccination rates is the key to tackling the problem.
Incidences of whooping cough were also up.
More top news
Part of the Great Orme has been bought by the National Trust in an effort to safeguard it for the future. But how much do you know about it?
The future of vast areas of the Great Orme in Llandudno has been safeguarded by the National Trust. It's thanks to a 50 year campaign.
WEA Cymru, which runs integration courses for non-EU migrants, says counter-extremism schemes must not 'dictate' to communities here.