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
The story of how Wales have taken their qualifying campaign by storm, to put themselves within touching distance of Euro 2016.
A 110-year-old All Blacks rugby shirt has sold for £180,000 at auction in Cardiff. We've been taking a look at what else you could buy...
As Super Saturday approaches it's not just us that are preparing to get behind Team Wales. Our pets are getting in the spirit too!