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.
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Sunny spells will develop but the winds will be strong, especially along the coast and over high ground. The odd light shower is likely too.
Theresa May promises a new relationship with governments of Wales, Scotland and Northern Ireland ahead of Brexit talks between the nations