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
Wales Women overcame a plucky Scotland side to record a 23-10 victory at the Gnoll.
It will be a cold night, with clear skies for most, which will allow a widespread and sharp frost to develop
Catch up with this week's episode of Newsweek Wales.