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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Through this evening and overnight it will remain cloudy with some persistent rain and drizzle by dawn.
A couple from Wales, who moved to South Africa to live 40 years ago, have been killed on their farmland estate there, police have confirmed.
Our Valleys Correspondent Hannah Thomas has been spending time discovering why the people who live in the Valleys love their communities.