Dr Marion Lyons of Public Health Wales says with 20 new cases of measles daily in Wales at the moment a death would not be surprising.
An investigation is underway on Friday to find out if a 25 year-old man from Port Tennant near Swansea died from the virus.
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Rain clearing then mostly dry with some warm sunshine.
The Welsh Government says the pilot aims to support low-income families with the extra costs during the summer schools holidays.
After a soggy day across much of Wales things will start to settle down over the weekend with a return to hot summer sunshine next week!